Mark Rober Lands Eggs From 100,000 Feet Using Mars Entry Hardware
Mark Rober
The three-year project succeeded only after abandoning precision fin steering in favor of NASA-style staged aerobraking and an autonomous emergency jettison that saved the payload when the balloon unzipped.
AI-assisted summary of Egg Drop From Space — original source. Check the original for full context.
Source published:
Key ideas
- Mark Rober completed a three-year engineering project dropping a raw egg from the stratosphere (over 100,000 feet) to establish a future-proof world record without building-height limitations. (0:00)
- Following an FAA and missile guidance warning from Mars rover chief engineer Dr. Adam Steltzner, the team abandoned autonomous fin-guided mattress targeting in favor of Mars entry, descent, and landing architectures. (10:33)
- At 100,000 feet, the zero-pressure balloon's termination cord twisted and unzipped prematurely, but an autonomous 20,000-foot abort sequence successfully saved the primary payload. (21:30)
- Both the primary rocket capsule and a redundant beach ball payload survived atmospheric descent and impact with zero cracked eggs, confirmed on-site by NASA engineer Al Chen. (23:17)
Detailed notes
## Background Published on YouTube by Mark Rober on November 25, 2022, this video documents a three-year endeavor to create a future-proof world record egg drop from the upper atmosphere. The description jokes about attempting the feat on Mars next year while promoting his CrunchLabs toy subscription, highlighting test footage from collaborator Joe Barnard, and thanking Night Crew Labs for their high-altitude balloon assistance.
## TL;DR Mark Rober sets out to perform an ultimate egg drop from the edge of space using an unpowered rocket designed to break Mach 1 before ejecting an egg onto a ground mattress. After multiple low-altitude tests in Gridley fail due to inverted guidance code, aerodynamic death spirals, and the realization from NASA engineer Adam Steltzner that terminal guidance to a mattress mimics an illegal guided missile, the team completely re-engineers the project with Mars landing heritage. Relocating to the desert, they deploy a zero-pressure balloon carrying a staging rocket with parachutes, airbags, and internal heaters, alongside a redundant shock-absorbing beach ball. When twisted rigging accidentally triggers the balloon's self-destruct rip-cord at 100,000 feet, an autonomous abort sequence successfully ejects the payload at 20,000 feet, delivering two perfectly intact eggs to the desert floor.
## Atmosphere & style The video blends Mark Rober's trademark energetic, educational showmanship with an unusually vulnerable and exhausting emotional arc. Early scenes carry an upbeat, playful maker-lab enthusiasm between Mark and rocketry partner Joe Barnard, but repeated hardware disasters, costly scrubs, and high-altitude crashes introduce real anxiety, financial strain, and personal demoralization. The storytelling shifts between accessible physics lessons and high-tension aerospace drama, culminating in a pulse-pounding recovery sequence across the desert that resolves in joyous, hard-earned triumph alongside NASA flight controller Al Chen.
## Bulletin - [00:00](https://www.youtube.com/watch?v=BYVZh5kqaFg&t=0s) Mark Rober completed a three-year engineering project dropping a raw egg from the stratosphere (over 100,000 feet) to establish a future-proof world record without building-height limitations. - [10:33](https://www.youtube.com/watch?v=BYVZh5kqaFg&t=633s) Following an FAA and missile guidance warning from Mars rover chief engineer Dr. Adam Steltzner, the team abandoned autonomous fin-guided mattress targeting in favor of Mars entry, descent, and landing architectures. - [21:30](https://www.youtube.com/watch?v=BYVZh5kqaFg&t=1290s) At 100,000 feet, the zero-pressure balloon's termination cord twisted and unzipped prematurely, but an autonomous 20,000-foot abort sequence successfully saved the primary payload. - [23:17](https://www.youtube.com/watch?v=BYVZh5kqaFg&t=1397s) Both the primary rocket capsule and a redundant beach ball payload survived atmospheric descent and impact with zero cracked eggs, confirmed on-site by NASA engineer Al Chen.
## Key takeaways - [00:00](https://www.youtube.com/watch?v=BYVZh5kqaFg&t=0s) The project was designed to bypass physical skyscraper height limits by launching the egg into the stratosphere via high-altitude balloon. - [01:11](https://www.youtube.com/watch?v=BYVZh5kqaFg&t=71s) Ground cannon tests confirmed that an unpadded egg can survive an 83 mph impact into a mattress, exceeding its natural 75 mph terminal velocity. - [02:08](https://www.youtube.com/watch?v=BYVZh5kqaFg&t=128s) Mark Rober partnered with BPS.space creator Joe Barnard to handle rocket flight dynamics, telemetry, and autonomous fin steering. - [03:28](https://www.youtube.com/watch?v=BYVZh5kqaFg&t=208s) Pre-flight pad checks failed when metallic tracking tape placed directly over the GPS antenna triggered a premature egg ejection on the ground. - [04:54](https://www.youtube.com/watch?v=BYVZh5kqaFg&t=294s) A single inverted negative sign in the guidance software loop caused the fins to command reverse pitch, sending the first low-altitude test flight into an uncontrollable death spiral. - [07:35](https://www.youtube.com/watch?v=BYVZh5kqaFg&t=455s) High-altitude balloon targeting relies on data from over 1,000 global weather stations that launch radiosonde-equipped balloons twice daily at 00:00 and 12:00 UTC. - [10:33](https://www.youtube.com/watch?v=BYVZh5kqaFg&t=633s) Dr. Adam Steltzner warned that autonomously steering a payload down to a mattress from the stratosphere essentially constituted building an illegal precision-guided missile under federal law. - [10:33](https://www.youtube.com/watch?v=BYVZh5kqaFg&t=633s) The team redesigned the mission profile around Mars EDL heritage, utilizing atmospheric separation, Curiosity rover parachute nylon, and Spirit/Opportunity-inspired landing airbags. - [13:32](https://www.youtube.com/watch?v=BYVZh5kqaFg&t=812s) The first desert attempt was scrubbed when integration revealed the rocket joint lacked lateral bending stiffness to withstand Mach speeds, forcing a delicate helium deflating procedure. - [17:00](https://www.youtube.com/watch?v=BYVZh5kqaFg&t=1020s) Redesign improvements included a rigid structural joint sleeve, closed-loop thermal heaters to stop eggs from freezing in vacuum, and a redundant beach ball drop system. - [21:30](https://www.youtube.com/watch?v=BYVZh5kqaFg&t=1290s) A 10-minute payload spin during ascent inadvertently tightened the balloon's self-destruct rip cord, causing the zero-pressure balloon to unzip and plummet at 100,000 feet. - [23:17](https://www.youtube.com/watch?v=BYVZh5kqaFg&t=1397s) An autonomous sensor failsafe triggered at 20,000 feet, jettisoning the capsule from falling rocket debris and allowing its parachute to deploy successfully. - [23:17](https://www.youtube.com/watch?v=BYVZh5kqaFg&t=1397s) Both the high-tech rocket payload and the redundant beach ball recovered from the desert with their raw eggs completely intact. - [25:15](https://www.youtube.com/watch?v=BYVZh5kqaFg&t=1515s) Mark linked the project's trial-and-error design cycle to CrunchLabs Build Box kits designed to teach kids practical engineering resilience.
## Detailed walkthrough ### [00:00](https://www.youtube.com/watch?v=BYVZh5kqaFg&t=0s) Future-Proofing the World Record Egg Drop
The classic school egg drop competition challenges students to construct a protective apparatus that prevents a delicate, raw egg from shattering when dropped from extreme heights. While Mark Rober initially considered staging his drop from the world's tallest skyscraper, human architecture is a moving target that would inevitably render such an accomplishment obsolete. To establish an unassailable, future-proof world record, Mark resolved to bypass architectural feats altogether and drop an egg directly from outer space. Drawing on his engineering background landing spacecraft on Mars, he expected the project to be technically feasible, yet the three-year endeavor evolved into an overwhelming challenge. As Mark Rober reflects on the ambition and toll of the project, “But what I didn't know is this would be the most physically, financially, and mentally draining video I would ever attempt.”
```mermaid flowchart TD accTitle: Egg Drop Flight Profile accDescr: Sequence of the planned space drop from high-altitude balloon release down to mattress impact. subgraph Ascent ["Ascent Phase"] A["High-Altitude Balloon"] -->|"Lifts rocket to outer space"| B["Thermal Fairing Oven"] end subgraph Descent ["Descent & Guidance"] B -->|"Jettisons fairing"| C["Gravity Acceleration"] C -->|"Breaks Mach 1"| D["Autonomous Fin Guidance"] end subgraph Recovery ["Landing Phase"] D -->|"Releases egg at 300 ft"| E["Egg Free Fall at 75 mph"] E -->|"Impacts target"| F["Landing Mattress"] end ```
The flight architecture relies entirely on gravity and aerodynamics rather than propulsion. A custom rocket carrying the egg inside a heated thermal fairing is hoisted into the upper stratosphere by a high-altitude weather balloon. Upon release, the rocket falls back toward Earth, accelerating past Mach 1 to break the sound barrier. During descent, an onboard flight computer actively manipulates four motorized rear fins to guide the craft along a calculated glide path toward a ground target. At roughly 300 feet above the surface, the nose mechanism releases the egg into a clean free fall, allowing it to drop independently onto a specialized landing mattress placed in the target zone.
- Planned peak speed: Supersonic descent exceeding Mach 1 under gravitational acceleration alone. - Egg release point: 300 feet above the ground. - Primary landing target: An oversized mattress situated in an open recovery field.
---
[01:11](https://www.youtube.com/watch?v=BYVZh5kqaFg&t=71s) Terminal Velocity and the Mattress Proof of Concept
Before constructing high-altitude hardware, the engineering team had to determine whether an unpadded egg falling out of the sky could survive impact on a mattress. Falling objects do not accelerate indefinitely; they reach terminal velocity once the downward pull of gravity equals the upward aerodynamic drag of colliding air molecules. While an adult human's terminal velocity is approximately 120 miles per hour, an egg's lighter mass and shape cap its terminal falling speed at 75 miles per hour.
Unable to convince building managers or corporate legal teams to let them hurl raw eggs off skyscrapers onto mattresses below, Mark improvised a high-velocity ground test rig to simulate the impact. The test mechanism launched an egg directly into the landing cushion at 83 miles per hour—well above its natural free-fall limit. Upon retrieving the egg, the shell remained completely intact without hairline cracks. Evaluating the baseline test, Mark Rober says, “So our mattress will protect an egg even if it's traveling faster than its terminal velocity.”
---
[02:08](https://www.youtube.com/watch?v=BYVZh5kqaFg&t=128s) The Gridley Test Site and Division of Labor
The project relocated to the agricultural community of Gridley, California—the same rural location where Mark previously staged his elephant toothpaste world record. To prepare for an eventual space descent, the team scheduled a low-altitude flight characterization test from 10,000 feet to evaluate aerodynamic steering and descent dynamics. Mark partnered with Joe Barnard, the self-taught aerospace developer behind the channel BPS.space, who gained acclaim in the maker community by achieving propulsive, vertical model-rocket landings reminiscent of SpaceX Falcon boosters.
Joe assumed control of the rocket's flight dynamics, designing the telemetry, flight computer, and four actuated tail fins required to navigate toward the landing zone. Mark took charge of the payload bay: engineering a heated thermal enclosure to keep the egg from freezing solid during the frigid balloon ascent, breakaway fairing doors, and a mechanical release system to eject the egg just above the ground. In the middle of an open field, they arranged an enormous array of mattresses designed to give the guided rocket a forgiving target. Looking over the mounting logistical variables, Mark Rober remarks, “What could possibly go wrong besides like 4,000 things?”
- Division of responsibilities: Joe Barnard led avionics, telemetry, and steering fins; Mark Rober built the payload bay, heating enclosure, and egg release servo mechanism. - Primary test objective: 10,000-foot drop characterization to validate fin-based flight steering before committing resources to an orbital-edge balloon launch.
---
[03:28](https://www.youtube.com/watch?v=BYVZh5kqaFg&t=208s) Sourcing the Supersonic Egg and Dumb Failure Number One
To procure an authentic test egg, Mark visited a local Gridley farm coop, gingerly navigating squawking, pecking hens to extract a fresh egg from a nesting box. Celebrating the pickup, Mark proclaimed the hen's contribution as the first egg in history destined to fly supersonic at Mach 1. The team then assembled at 4:00 AM the following morning to take advantage of dead-calm atmospheric conditions before ground winds kicked up.
During final pad checks, the team added an improvised strip of metallic tracking streamer to the rear airframe so observers on the ground could spot the rocket against the sky. Joe ran through the redundant systems built into the avionics, noting dual leads, dual igniters, and twin servos on the fairing. Joe Barnard proudly emphasizes their precautions right before everything goes sideways: “No dumb failures.”
Moments later, the pad experienced its first failure. While carrying the suspended vehicle to the balloon, the flight computer's GPS malfunctioned, triggered the premature release sequence, and unexpectedly ejected the egg straight onto the dirt. The scrub forced them to vent the balloon's costly helium charge—a disappointment Mark softened by taking deep hits of the gas to deliver high-pitched commentary. Back in the workshop, diagnostic logs revealed that the metallic tracking streamer had been taped directly over the rocket's GPS antenna. The resulting signal interference corrupted the velocity math in the computer, tricking the firmware into reading an active drop sequence and dumping the egg.
---
[04:54](https://www.youtube.com/watch?v=BYVZh5kqaFg&t=294s) Flight Attempt One: The Rogue Negative Sign and Death Spiral
The following morning brought calmer winds but temperatures 20 degrees colder, leaving the mattress landing array stiff and partially frozen. Having replaced the metallic tracking streamer with non-conductive plastic film, Mark transported the armed rocket out to the balloon release site, and ground control successfully sent the stack into the air. Visual tracking held steady through early ascent, but telemetry quickly exposed an operational problem: the balloon's lift rate was significantly lower than pre-flight calculations had estimated.
```mermaid flowchart LR accTitle: Flight One Anomaly Flow accDescr: Sequence of errors during the first 10,000-foot flight test leading to the death spiral and fix. A["Slow Balloon Ascent"] --> B["Wind Drifts Stack Far South"] B --> C["Manual Ejection Triggered"] C --> D["Fins Command Reverse Pitch"] D --> E["Uncontrolled Death Spiral"] E --> F["Rocket Ground Crash"] F --> G["Code Review: Fix Single Negative Sign"] ```
Pushed along by upper-level winds while climbing too slowly, the craft drifted far to the south of its intended release window. Seeing the vehicle wander off its ascent profile, Joe Barnard warns, “We're already south, and we're only halfway up.” Recognizing that the unpowered rocket lacked the glide ratio to fight crosswinds back to the mattress, the team issued a manual drop command.
The moment the rocket decoupled, the active guidance fins failed to stabilize its heading. Instead of pitching toward the coordinates, the control surfaces violently induced a rapid spin, sending the vehicle into an uncontrolled death spiral. The rocket slammed into the ground at high speed. Mark and Joe tracked down the wreckage in an open pasture—briefly interrupted by Mark chasing a flock of resting birds across the grass. At the crash site, they found the release chute extended and the egg bay empty, proving the mechanical release had fired before impact. Joe reviewed the telemetry logs and onboard firmware that evening and discovered a single rogue negative sign in the control loop code: the guidance software had been commanding the control fins in reverse, exponentially amplifying roll rather than correcting it.
- Flight failure root cause: An inverted sign in the flight software control algorithm drove the fins hard-over into an uncontrollable spiral. - Positive takeaway: The physical payload mechanism and mechanical egg ejection chute operated as intended prior to ground impact.
---
[07:35](https://www.youtube.com/watch?v=BYVZh5kqaFg&t=455s) The Final Gridley Attempt and Atmospheric Drift Science
With replacement components and balloon supplies exhausted, the team faced their absolute final opportunity to validate the flight system at low altitude. A failure here would terminate the project, as an unproven control package could not be trusted on an ascent to space. Mark set up at the mattress site, knowing the entire program hinged on the next forty minutes. Looking around at the massive landing zone, Mark Rober says, “I'm standing in the middle of the world's largest mattress where hopefully the egg will be landing in like 45 minutes.”
Targeting a stationary landing pad using an unpowered balloon ascent requires meticulous wind profiling. High-altitude balloons cannot steer actively; their horizontal drift is dictated entirely by the wind speed and direction within every atmospheric layer they climb through. To place a balloon directly over a target at 10,000 feet, technicians model the forecasted wind shears and select a launch site miles upwind, allowing ambient currents to carry the rig over the target at drop altitude.
Predictive drift models rely on an international meteorology network. Twice every day, at precisely noon and midnight London time (UTC), technicians at more than one thousand designated stations worldwide release weather balloons simultaneously. Each balloon carries a specialized instrument package called a radiosonde, transmitting live altitude, pressure, humidity, and temperature data to construct the atmospheric profile required for flight planning.
- Global sounding frequency: Twice daily at 00:00 and 12:00 UTC across more than 1,000 stations. - Primary sounding payload: Radiosondes measuring atmospheric pressure, temperature, altitude, and drift vectors.
[09:15](https://www.youtube.com/watch?v=BYVZh5kqaFg&t=555s) The Third Attempt and the Weather Balloon Fleet
Mark explains the broader science behind their launch method: roughly 2,000 massive weather balloons are released across the globe every day. They measure atmospheric temperature and wind, continuously transmitting that data back to ground supercomputers, which makes modern weather forecasting remarkably accurate. Once they reach high altitudes, the balloons burst and plummet to Earth, prompting hobbyists to hunt them down by their transmitted signals.
On their third test launch, the team releases the rocket directly within the target drop zone. Tracking telemetry in real time, Joe calls out the dropping altitude:
``` Joe: "400." Joe: "Altitude 98 meters." ```
Mark screams with excitement as the payload slams into the ground nearby, exclaiming, “That was exhilarating.” While the rocket managed to steer slightly in the right direction and landed far closer to the target than previous tries, the egg did not survive. When Joe locates the impact point and inspects the cargo, he delivers the verdict: “I mean, it's not not cracked.”
[10:33](https://www.youtube.com/watch?v=BYVZh5kqaFg&t=633s) The Adam Steltzner Reality Check and the Mars Architecture Pivot
With three consecutive failures, Mark realizes they need outside expertise and calls up his former colleague Dr. Adam Steltzner—a Caltech PhD holder, the lead engineer famous for the Curiosity Mars rover's sky crane landing, and Chief Engineer for both the Perseverance rover and the Mars Sample Return mission.
After hearing Mark explain their setup—guiding an egg down from space to hit a mattress in a small town—Adam cuts straight through the fantasy: “And you're doing terminal guidance to something about the size of a house. How are you gonna do that? How do you do that? I mean, I know how you physically do that. How do you not get busted by the FAA?” He drives the point home even more bluntly: “Dude, there are thousands of people who have done this before, and they are sworn by federal law not to say a single [beep] word to you.” Mark acknowledges that by attempting to hit a mattress autonomously from the stratosphere, they were essentially building an illegal precision-guided missile—and publishing a how-to tutorial on YouTube would carry massive legal and ethical risks.
Following Adam's advice on atmospheric heating and staged deceleration, the team completely discards their old architecture and moves the test to an open desert. They redesign the flight system from scratch over several months, adopting the proven entry, descent, and landing profile of Mars missions:
```mermaid flowchart TD accTitle: Desert Egg Drop Architecture accDescr: Sequence showing how the redesigned rocket ascends by balloon, achieves supersonic descent, stages, aerobreaks, deploys parachutes, and cushions the landing.
subgraph Ascent ["Ascent Phase"] A["Zero-Pressure Weather Balloon"] --> B["High-Altitude Release"] end
subgraph Supersonic ["Supersonic Descent"] B --> C["Heavy Rocket with Fixed Fins\n(Hits Supersonic Speeds)"] end
subgraph Staging ["Atmospheric Staging & Aerobraking"] C --> D["Mid-Descent Separation of Aft Body"] D --> E["Lighter Forward Payload Naturally Aerobreaks"] end
subgraph Landing ["Terminal Deceleration & Impact"] E --> F["Deploy Parachute (Curiosity Nylon)"] F --> G["Jettison Nose Cone"] G --> H["Inflate Airbags (Spirit/Opportunity Heritage)"] end ```
To execute this architecture, the new rocket features rigid, non-moving fins and is engineered to be three times as long and four times as heavy as the prior prototype to guarantee supersonic velocity on re-entry. Halfway down, the vehicle separates from its heavy aft section, radically shedding weight so the forward payload naturally aerobrakes to a lower terminal velocity. It then deploys a parachute cut and sewn from an authentic spare nylon swatch from the Curiosity rover's actual 80-panel landing parachute, followed by jettisoning the nose cone to expose impact-absorbing airbags modeled on the Spirit and Opportunity Mars Exploration Rovers.
[13:32](https://www.youtube.com/watch?v=BYVZh5kqaFg&t=812s) The Desert Scrub and the Integration Failure
The night before the launch, the team works late into the night at their desert hotel finalizing hardware for the three-year passion project. Mark reflects that despite all the preparation, “it was the laws of physics that would ultimately determine our fate.” Early the next morning, the launch crew from Night Crew Labs begins inflating a specialized zero-pressure balloon using four large helium tanks. Unlike common closed latex balloons that burst at peak altitude, zero-pressure balloons are open at the bottom to equalize internal and external pressure, allowing them to stay aloft indefinitely, carry heavier payloads, and float higher. When terminating the flight, an operator sends a radio command that pulls an integrated tear-line string down the side, splitting the plastic envelope open like a zipper.
An hour into inflation, the operation hits a catastrophic snag. Because the balloon film is extraordinarily thin and delicate—requiring handlers to wear gloves to prevent micro-abrasions—Mark is forced to call an immediate halt to the fill:
> “Hey, dude, I got bad news. We have to scrub, start taking the helium out of the balloon.”
Joe had built the aft propulsion/fin assembly while Mark's shop handled the forward payload and airbag module. While both halves had been independently verified, they had not been mechanically mated until the launch field that morning. Under handling, Mark discovers a massive structural flaw: the joint between the two sections possessed plenty of tension and compression strength along its axis, but lacked the lateral stiffness needed to counter bending moments.
> “The problem is this is so long and heavy, as soon as it wiggles, it's going to want to bend. Great tension compression. But this happening at Mach Two is... that's not gonna work out.”
Because large zero-pressure balloons are in extremely short supply—this was the only balloon of its class they could source for at least a month—they are forced to painstakingly reverse the pumping process to extract the helium, praying the delicate material does not tear during packing. Mark calls the scrub an absolute personal low point: “The integration of two independent systems is such a classic failure point in engineering. I was crushed, I had missed this, and financial concerns aside, I felt like I had just let everyone down.”
[17:00](https://www.youtube.com/watch?v=BYVZh5kqaFg&t=1020s) Resiliency and the Four Engineering Upgrades
Turning the defeat into a teachable moment, Mark points out that failing is simply discovering one more way not to do something. He connects this resilient engineering mindset directly to his educational kit company, CrunchLabs, where kids build hands-on mechanical toys via the monthly Build Box.
To eliminate every point of failure for their final desert launch attempt, Mark and his engineering team commit to four major redesign priorities:
- **Structural Sheath Joint and Pyrotechnic Staging:** Replacing the flexible connection with a rigid structural sleeve designed to absorb lateral bending moments, paired with an autonomous black-powder separation charge to sever the two rocket halves at altitude. - **Thermal Vacuum Egg Protection:** Testing raw eggs inside vacuum and sub-zero thermal chambers, which revealed that during the two-hour ascent to space, extreme cold and zero atmospheric pressure freeze and crack eggs without active protection; they installed closed-loop heaters inside the payload core. - **Space-Grade Hardware Redundancy:** Emulating NASA planetary mission design principles—where hardware cannot be serviced after launch—by adding backup systems across critical flight channels, drawing on Mark's personal experience designing the Curiosity rover's sample manipulation arm hardware.
[18:27](https://www.youtube.com/watch?v=BYVZh5kqaFg&t=1107s) Redundant Solutions and Terminal Velocity Drop Tests
Drawing on NASA's principle of engineering redundancy—such as the Mars rover belly having two identical doors leading to the exact same compartment in case one ever fails—the team devised a radically simple backup plan. They created a custom, two-foot-wide beach ball stuffed with packing materials and a second egg, trailing a 20-foot streamer off the back. Designed to drop like a rock without any parachutes, complex release mechanisms, or autonomous timing sequences, Mark Rober explained: “This would be our redundant yet I would argue kind of boring second chance opportunity to land a safe egg.”
To validate both descent vehicles before heading back into the field, they transported the setups to a local crane yard to simulate impacts at their calculated terminal velocities. Releasing the beach ball first from the crane produced an audible sigh of relief when the interior egg remained completely intact. They followed with the rocket payload's final landing configuration, where the custom rover parachute deployed and held up under load, confirming the airbags and shock-absorbing systems were finally ready.
- The redundant system utilized a custom 2-foot beach ball packed with cushioning and a 20-foot drag streamer. - Drop tests at the crane yard verified terminal velocity survival for both the beach ball and the rocket parachute assembly.
[19:31](https://www.youtube.com/watch?v=BYVZh5kqaFg&t=1171s) The Fifth Desert Launch and Al Chen's Arrival
After enduring four failed launch campaigns over three long years, the crew set off on the six-hour drive back into the desert, feeling cautiously optimistic. They were immediately greeted by two encouraging developments. First, they verified the structural integrity of their zero-pressure balloon. Because these thin balloons are impossible to source quickly and even light handling can stress the film and cause micro-tears, they had to reuse the fragile unit from the prior attempt. Mark obsessively monitored a hanging fish scale measuring the balloon's lift: “The force reading is 37.6 kilograms of buoyancy force pulling this up. Importantly, it's not changing. If it were changing and going down, that means we would have a leak.”
The second morale boost came in the person of NASA engineer Al Chen, Rober's longtime friend and good-luck charm, famous for announcing Curiosity's touchdown with the historic words: “Touchdown confirmed we're safe on Mars.” Chen was brought in so that if the drop succeeded, he would deliver the official call. With all pre-flight checklists cleared, the ground crew counted down from three and released the balloon. The balloon ascended smoothly at the exact predicted climb rate, taking about two hours to reach float altitude. Once it passed 30,000 feet, Mark and the team packed into chase vehicles to begin the 45-minute drive toward the downrange landing area.
```mermaid flowchart TD accTitle: Desert Launch and Tracking Flow accDescr: Sequence of events from pre-flight balloon checks through ascent to 100,000 feet. subgraph PreLaunch ["Pre-Launch Verification"] A["Buoyancy Scale Check: 37.6 kg holding steady"] --> B["Al Chen Arrives as Mission Flight Controller"] end subgraph Ascent ["Ascent Milestones"] B --> C["Liftoff: Zero-pressure balloon ascends"] C --> D["30,000 ft: Chase vehicles depart for landing zone"] D --> E["100,000 ft (19 miles): Visual sighting from ground"] end ```
[21:30](https://www.youtube.com/watch?v=BYVZh5kqaFg&t=1290s) Catastrophe at 100,000 Feet: The Self-Destruct Unzip
While tracking the balloon from the road, the team hit a major altitude milestone as the telemetry crossed 100,000 feet—over 19 miles high and roughly two and a half times the cruising altitude of a commercial airliner. Looking through binoculars, they could plainly see the balloon expanded against the dark sky. The celebration was cut short when Joe noticed through his optics that the balloon suddenly seemed to shrink and vanish, moments before the tracking team called in the bad news: the balloon had plummeted 30,000 feet in just two minutes.
While zero-pressure balloons are not supposed to burst like latex balloons, telemetry revealed an unforeseen mechanical chain reaction. Over a ten-minute span, the suspended rocket and beach ball had steadily spun relative to the balloon overhead. This rotation twisted the suspension rigging tighter and tighter until the cord pulled down on the emergency flight-termination lanyard. As Mark recounted: “It pulled down on the balloon string that is designed to essentially unzip and destroy itself.” Without having ever triggered the command to release either egg vehicle, the entire tangled assembly began falling toward Earth at 150 miles per hour.
```mermaid flowchart TD accTitle: In-Flight Failure and Autonomous Abort accDescr: Mechanics of the balloon failure followed by autonomous payload separation. subgraph Failure ["100,000 ft: Inadvertent Termination"] F1["Rocket and Beach Ball spin under balloon"] --> F2["Rigging twists self-destruct lanyard tight"] F2 --> F3["Rip-line pulled: Balloon unzips"] F3 --> F4["Tangled mass plummets at 150 mph"] end subgraph Abort ["20,000 ft: Autonomous Recovery"] F4 --> A1["Autonomous sensor detects 20,000 ft threshold"] A1 --> A2["Payload forcibly ejects from tangled rocket"] A2 --> A3["Orange parachute deploys and cushions impact"] end ```
[23:17](https://www.youtube.com/watch?v=BYVZh5kqaFg&t=1397s) Desert Recovery: Two for Two from Space
Mark described the frantic drive toward the crash coordinates as their "Apollo 13 moment." Survival depended entirely on an automated failsafe programmed into the rocket: if the core payload could autonomously jettison itself from the descending wreckage once it crossed 20,000 feet, it could still deploy its orange parachute and cushion the egg with its airbags. Arriving in the desert about two miles out from the coordinates, the crew began combing the terrain on foot until they spotted the parachute resting alone on the desert floor, proving the autonomous separation logic had fired perfectly mid-descent.
Crowding around the capsule, Mark wiped away dirt to peek through the viewport, unsure whether the egg inside had survived the violent abort. Carefully unscrewing the capsule hatch, they pulled out an intact, uncracked egg that was noticeably warm from the journey. Al Chen made the official call: “Touchdown confirmed. We're safe on earth.” To complete the sweep, they hiked out to find the redundant beach ball, which had also impacted cleanly. Opening its packaging revealed that its egg was equally pristine, securing a perfect two-for-two success after three years of attempts. Reflecting on the journey, Mark noted that while plans rarely execute cleanly, engineering tenacity and learning from failure can overcome almost anything.
- The primary payload autonomously ejected from the falling debris at 20,000 feet, deploying its orange parachute. - Both the primary space capsule egg and the backup beach ball egg survived terminal velocity impacts with zero cracks. - NASA's Al Chen delivered the mission's official landing confirmation call in the field: “Touchdown confirmed. We're safe on earth.”
[25:15](https://www.youtube.com/watch?v=BYVZh5kqaFg&t=1515s) CrunchLabs Build Box and Engineering Mindset
Connecting the multi-year egg drop project back to everyday engineering, Mark highlighted that hands-on failure and troubleshooting are the best ways to learn physics. He introduced the CrunchLabs Build Box, a monthly subscription service delivering hands-on engineering kits directly to households. Each monthly box is paired with an exclusive video where Mark guides subscribers through the assembly and explains the underlying physics principles, focusing on building practical problem-solving skills and resilience.
Rober showcased several upcoming build projects, including an ultra-accurate rapid-fire disc launcher, a mechanical linkage drawing machine, and a Rube Goldberg-style catapult launcher. He also shared details about the physical CrunchLabs facility where the projects are engineered, which features a tennis ball cannon, the world's longest Hot Wheels track, and a massive foam pit. Monthly box recipients also have the chance to find a platinum ticket, granting winners and their families an all-expenses trip to tour CrunchLabs and build inventions alongside Mark and his design team.
- Mark highlighted the educational philosophy of the program: “You're basically unlocking your own personal Mark Rober video every month where you learn a new engineering principle that will have you not just building like an engineer, but more importantly thinking like an engineer.” - Featured kit examples included a rapid-fire disc launcher, a linkage-driven drawing machine, and a chain-reaction catapult. - Monthly kits include a chance to discover a platinum ticket for a family visit to the CrunchLabs facility.
## Notable quotes > [13:32](https://www.youtube.com/watch?v=BYVZh5kqaFg&t=812s) The integration of two independent systems is such a classic failure point in engineering. — Mark Rober
## Mentioned Mark Rober, Joe Barnard, Adam Steltzner, Al Chen, BPS.space, Night Crew Labs, CrunchLabs, Curiosity rover, Perseverance rover, Mars Sample Return mission, Spirit and Opportunity rovers, NASA, FAA, Caltech, Gridley, California
## Video description Next year we’re doing this on Mars.
Get your CrunchLabs Toys today: https://crunchlabs.com/ToysYT
You should also go subscribe to the Crunchlabs YouTube channel cause we’ve got some bangers in the pipeline- https://www.youtube.com/crunchlabs
You can check out Joe’s video that goes into some more detail about the testing here- https://youtu.be/5tQ6OTJdhns
Shout out to my friends at Night Crew Labs who did all the high altitude balloon work. You can hire them too! Learn more at: www.nightcrewlabs.com
Also thanks to these folks for providing some of the music in the video:
Laura Shigihara - https://www.youtube.com/supershigi Ponder - https://youtube.com/@Pondermusic Andrew Applepie - https://soundcloud.com/andrewapplepie Blue Wednesday - https://soundcloud.com/bluewednesday
NO PURCHASE NECESSARY. Promotion starts on 1/1/2023 & ends on 12/31/23, subject to monthly entry deadlines. Open to legal residents of the 50 U.S. & D.C., 18+. 1 prize per month: each month is its own separate promotion. For the first 2-3 months, winner may be notified via phone call instead of winning game piece. If a monthly prize is unclaimed/forfeited, it will be awarded via 2nd chance drawing. See Official Rules at crunchlabs.com/sweepstakes for full details on eligibility requirements, how to enter, free method of entry, prize claim procedure, prize description and limitations. Void where prohibited.
[Source](https://www.youtube.com/watch?v=BYVZh5kqaFg)