Fénix 2 was a purpose-built, one-person steel cage engineered to move miners through the narrow rescue shaft drilled into Chile’s San José mine. Rollers kept it from battering the shaft walls, a crossed hoisting cable reduced rotation, a harness held the passenger, and communications and medical provisions connected the rider with rescuers during the ascent.
The capsule was one part of a Chile-led operation that brought 33 miners to the surface 69 days after the mine collapsed on August 5, 2010. NASA supplied engineering and life-sciences advice, while Chilean engineers and the naval shipyard ASMAR designed and built the cages.
What Fénix 2 actually did
Fénix 2 carried one person at a time between the underground refuge area and the surface through a newly drilled rescue shaft. It was not a standard mine conveyance or an off-the-shelf rescue product. Its dimensions, suspension, restraints and safety systems were selected for one unusually difficult route: a long borehole whose walls could be rough, misaligned or slightly crooked.
The rescue capsule had to be narrow enough to fit the opening but robust enough to protect a passenger during repeated trips. It also had to be recoverable if the cage jammed. That combination explains why the design looks simple from the outside yet contains several layers of mechanical and medical protection.
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Why the San José shaft demanded a special cage
A drilled borehole is not the same as a straight, finished elevator shaft. Its diameter limits the capsule’s width, and small deviations from a perfect line can create rubbing, impacts or a jam. The cage therefore had to remain short enough to tolerate a non-straight opening while still providing a stable enclosure for an adult passenger.
NASA oral-history accounts describe the central engineering problem as a balance between strength, safety and recoverability. A capsule that was too large could not pass; one that was too long could bind in a crooked section; one that could not be recovered would create a second emergency. The team also considered the psychological and practical importance of two-way communication while a miner was isolated in the shaft.
How the capsule moved through the borehole
Rollers protected the cage and reduced friction
Exterior rollers surrounded the capsule. NASA describes them as cushioning the ride, reducing friction with the shaft walls and lowering the chance that the cage would stick. Alejandro Poblete, the mechanical engineer credited by Codelco with the concept and basic engineering, singled out the wheels as a key feature because they kept the cage from striking the shaft.
The rollers did not make the borehole perfectly straight or eliminate every obstruction. Their purpose was to let the capsule follow the drilled opening with controlled contact instead of allowing its body to scrape or slam directly into the rock and casing. That distinction matters: the wheels were a risk-control device, not a performance guarantee.
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Codelco reports that Fénix 2 was hoisted on a 24-millimetre cable arranged in a crossed pattern. The arrangement was intended to resist unwanted spinning as the cage traveled. NASA also identifies the exterior rollers as part of the ride-control system, but the cable pattern addressed a different problem: keeping the passenger’s orientation more stable while the cage was suspended.
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Rotation could make the trip disorienting and could increase the likelihood of the cage contacting the shaft. The crossed cable and the roller system therefore worked on separate hazards—one controlling twist in the suspension, the other moderating contact with the walls.
Published dimensions use different descriptions
The available accounts do not present one harmonized set of dimensions. Codelco describes Fénix 2 as about 4.5 metres tall and weighing 250 kilograms. NASA Langley describes a one-person capsule 13 feet long and weighing 926 pounds. Those figures should be read as attributed descriptions rather than silently converted into a single specification: the sources use different dimensional terms and measurement systems.
How the passenger was protected
Harness and enclosure
A harness secured the miner inside the cage. The restraint kept the rider positioned during acceleration, braking and any bumps against the shaft, rather than relying on the passenger to stand or hold on for the entire journey.
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Codelco confirms a microphone and loudspeakers in the capsule. NASA’s account describes audio and video communication, allowing the passenger and the rescue team to exchange information during the ascent. Communication was operationally important as well as reassuring: rescuers could receive reports from inside the cage and give instructions if a problem developed.
Oxygen and medical monitoring
NASA also lists emergency oxygen and medical probes, including heart monitoring, among the capsule’s provisions. These details belong specifically to NASA’s description; Codelco’s account independently confirms the communications equipment but does not list every medical feature. The equipment gave the surface team a way to watch vital signs and respond to a medical emergency during the ride.
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What happened if the capsule became stuck?
The bottom trap door
NASA describes a trap door in the bottom of the capsule as a contingency for a jam. If the cage could not continue upward, the passenger could leave through the bottom and descend back down the shaft. This was an escape and recovery option, not part of the normal extraction procedure.
The mineral bed at the lower landing point
Poblete describes a separate precaution at the lower end of the route: a bed of mineral placed where the cage rested. In his explanation, the bed prevented the capsule from moving completely out of the shaft, making it easier to put the cage back into the duct. The landing-area measure and the bottom hatch addressed different moments of a failure—the first helped keep the cage recoverable at the bottom, while the second gave a rider an option if the cage jammed during transit.
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Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Poblete’s Spanish wording, quoted by Codelco, is: “las ruedas para que la jaula no se golpeara y la cama de mineral que colocamos abajo, en el lugar donde se posaba la jaula. Así no se salía por completo del ducto y no teníamos problemas para volver a introducirla”. In English translation: “the wheels so the cage would not hit [the shaft walls], and the mineral bed we placed below, where the cage rested. That way it did not come all the way out of the shaft and we had no problems putting it back in.”
What was inside Fénix 2?
The capsule’s interior was organized around keeping one passenger restrained, connected and medically observable:
- A harness to hold the miner in position.
- A microphone and loudspeakers confirmed by Codelco for communication with the surface.
- Audio and video communication described by NASA.
- Emergency oxygen described by NASA.
- Medical probes, including heart monitoring, described by NASA.
- A bottom trap door described by NASA for the stuck-capsule contingency.
The sources do not provide a complete inventory of every tool, control or material carried inside. It is more accurate to identify the documented systems than to turn the capsule into a detailed equipment list that the published accounts do not establish.
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Who designed and built the rescue capsule?
Chilean design leadership
Codelco credits Alejandro Poblete, a mechanical engineer and former worker at the El Teniente mine, with the capsule’s conceptual and basic engineering design. His comments about the wheels and mineral bed explain how specific features were tied to recovery problems in the shaft.
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ASMAR’s construction work
Codelco says construction was carried out at ASMAR, Chile’s naval shipyard. ABS Consulting likewise reports that ASMAR designed and built the cages. ABS says three capsules were manufactured: one used in the rescue and two retained as backups.
NASA’s supporting role
NASA supplied technical advice rather than leading the operation. NASA’s history describes a team advising Chilean officials on engineering, medical, nutrition and psychological questions and helping prepare an engineering-requirements document. NASA characterizes its work as a contribution to the broader Chilean effort. The capsule’s Chilean design and construction credits should therefore remain distinct from NASA’s advisory contribution.
How the extraction worked, one trip at a time
- The rescue shaft provided the route between the surface and the trapped miners.
- Fénix 2 was lowered through the opening as a one-person cage.
- A miner entered the capsule and was secured by the harness.
- Communication equipment connected the passenger with the rescue team; NASA’s account also places medical monitoring and emergency oxygen on board.
- The hoisting system raised the capsule on the 24-millimetre crossed cable, while rollers moderated contact with the shaft.
- The miner exited at the surface, and the cage was prepared for the next passenger.
The repeated cycle is why the design emphasized recoverability and ride control. The capsule was not simply lowered once and abandoned; it had to make successive trips for all 33 miners.
Risk matched to feature
| Risk in the rescue shaft | Fénix 2 response | What the sources establish |
|---|---|---|
| Impact with shaft walls | Exterior rollers | NASA describes cushioning and reduced friction; Poblete identifies wheels as preventing strikes. |
| Friction and possible sticking | Rollers around the capsule | NASA says the rollers lowered the risk of sticking. |
| Unwanted rotation | Crossed hoisting-cable arrangement | Codelco reports the 24 mm cable and crossed pattern to reduce rotation. |
| Passenger movement during the ride | Harness | Codelco confirms the restraint. |
| Isolation from the surface | Microphone and loudspeakers; NASA also reports audio/video | Communication equipment is documented by Codelco, with the fuller system described by NASA. |
| Medical deterioration | Emergency oxygen and vital-sign probes | These provisions are described in NASA’s account. |
| A capsule jam during ascent | Bottom trap door | NASA describes the rider’s option to exit and descend. |
| Capsule moving too far out of the lower shaft | Mineral bed at the landing point | Poblete describes it as helping the cage remain easy to reinsert. |
How many capsules were made?
ABS Consulting’s November 1, 2010, account reports that three cages were manufactured. One served in the rescue and two were backups. This is an event-and-production count, not a published failure-rate or comparative-performance statistic.
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No cited source establishes a controlled test comparing Fénix 2 with another capsule, a capsule failure rate, or a current commercial replacement. The available figures describe the historical device and operation rather than a consumer product specification.
What the rescue proves—and what it does not
Fénix 2 demonstrates how a rescue device can be designed around a particular shaft and a defined set of hazards. Its wheels addressed wall contact, the cable pattern addressed rotation, the harness addressed passenger security, communication equipment addressed isolation, and the hatch and mineral bed addressed different recovery scenarios.
That does not mean every feature was validated by a published laboratory comparison or that the capsule was intended for general mine use. The documented operation was a Chilean emergency response for the San José mine, supported by NASA advice and built by ASMAR. Measurements, equipment lists and production details should be quoted with their source attribution rather than generalized into a universal capsule design.
Why Fénix 2 mattered in the 2010 rescue
The capsule converted a narrow, uncertain borehole into a controlled passenger route. Its small size allowed it to fit the drilled opening; its rollers and cable arrangement helped it travel without excessive impact or spin; its harness and communications kept a miner secured and connected; and its contingency features gave rescuers options if the mechanical plan encountered trouble.
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Those choices were practical responses to the geometry and uncertainty of the shaft. The result was a compact cage built for one extraordinary job: carrying each of the 33 trapped miners to the surface after 69 days underground.
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