NASA has returned four astronauts from the International Space Station in the first medical evacuation ever carried out in U.S. human spaceflight, after one crew member developed a health condition that required further evaluation on Earth.
The astronauts landed safely in a SpaceX Crew Dragon capsule, which splashed down in the Pacific Ocean off California on Thursday, January 15, 2026, bringing their mission to an early close.
Those on board were NASA astronauts Zena Cardman and Mike Fincke, Japan Aerospace Exploration Agency astronaut Kimiya Yui, and Russian cosmonaut Oleg Platonov.
NASA said the medical issue could not be adequately assessed or treated in orbit but stressed that the affected astronaut was stable during the return. Specific details were not released to protect medical privacy.
According to NASA, flight surgeons and mission managers jointly determined that an early return was the safest option.
While astronauts have previously come home ahead of schedule for technical or operational reasons, the agency confirmed this was the first time a mission was ended specifically for medical reasons.
The crew had spent roughly five and a half months aboard the ISS before the early departure.
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After splashdown, recovery teams retrieved the capsule and transported the astronauts for standard post-flight medical checks and rehabilitation.
NASA said the reduced crew size on the space station will not affect safety, though some activities may be rescheduled until a new crew arrives.
The agency described the successful return as a demonstration of its ability to respond swiftly to medical situations in orbit while maintaining astronaut safety as a top priority.