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.

SpaceX's Crew-11 astronauts will leave the International Space Station today (Jan. 14) in the first-ever medical evacuation from the orbiting lab, and you can watch it live.