Stowaway (2021)
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However, the situation becomes grim with the discovery that the explosion that had initially injured Michael also destroyed the CDRA system, a device which scrubs carbon dioxide from the atmosphere on the spaceship, forcing the crew to use emergency lithium hydroxide canisters to scrub CO2 from the air. However, the Mars Cycler spacecraft was originally designed for two crew members (with the third being added with the extra margins available), and the canisters can only keep two people alive. In order to attempt to create enough oxygen to support the now four-person crew, Marina orders David to use begin cultivating his algae onboard the cycler, instead of on Mars as originally planned. He uses half of his supplies to create one batch of algae, which supplies enough oxygen for a third crew member. When the algae underperforms, David attempts to use the remainder of the algae to create a second culture, however, the second batch dies within days.
Marina and David contemplate eliminating Michael (since neither mission control nor any of them can figure out a non-risky plan for obtaining more oxygen). Nevertheless, at the urging of Zoe, Marina extends the deadline for the decision by ten days. After David's first batch of algae dies, he tells Michael about the situation on the ship and offers him an injection for a painless death. Devastated, Michael nearly follows through, but Zoe convinces him to hold out for a few days longer. [5] To save him, Zoe proposes the initially rejected plan of retrieving a potentially considerable amount of untapped LOX remaining in the upper stage of their launch vehicle (which has been attached to the cycler spacecraft to act as a counterweight for the centripetal force-driven artificial gravity of their spacecraft) in a risky and untested EVA operation. Once David's second batch of algae dies, this becomes the only option left.
Since Michael is inexperienced, Zoe and David perform the EVA and successfully fill two tanks, which along with the lithium hydroxide canisters, are enough for four people to survive. However, the crew are then alerted to the incoming deadly radiation from a CME-high-energy solar flare.[6] Zoe and David are forced to leave the second tank slowly leaking oxygen while they rush back to the spacecraft with only one tank. But when Zoe falls while returning to the ship, the tank becomes detached from her and drifts away into space.
After they regroup, the crew realizes that someone will need to go through the radiation to retrieve the other tank. With one tank, there will only be enough oxygen for a total of three people but the person retrieving the tank will most likely not survive the radiation. Although David and Michael both volunteer, Zoe chooses to do so. Working through radiation burns, she manages to fill the tank and return it to the spacecraft, before succumbing to the radiation, spending her final moments sitting outside the spacecraft, gazing at Mars amongst the stars.
