The crew member of concern is doing fine,” NASA said after their return early Thursday, the first time in the space station’s 25-year history that a crew returned home early because of a medical concern.

After a health issue, four astronauts are set to leave the International Space Station early, with a pre-dawn Pacific splashdown planned for Thursday, Jan. 15.

The Crew-11 mission has left the International Space Station and have arrived back on Earth. Crew Dragon Endeavour and its crew of four — comprised of two NASA astronauts, one Japanese astronaut, and one Russian cosmonaut — splashed down in the Pacific Ocean at 12:40 AM PST (08:40 UTC) on Thursday, Jan. 15.

Instead of remaining at the International Space Station (ISS) for the full duration of their mission, the four crew members are coming home a month early due to a medical issue with one of the astronauts.

The SpaceX Crew-11 mission ended with a splashdown after over five months on the ISS due to a medical issue. The crew underwent postflight reconditioning. They celebrated 25 years of continuous human presence on the ISS.