Four astronauts are hours away from strapping into a spacecraft and departing the International Space Station about a month early after one of them experienced a health issue. The impending departure would mark the first time in the station's 25-year history that a crew on the orbital outpost has cut a mission short in order to be medically evacuated.

Crew-11 is preparing for an unprecedented early return to Earth over concerns for an astronaut's medical condition aboard the International Space Station.