NASA recently to the International Space Station (ISS) a month early, citing a medical issue with one of the astronauts. The space agency just revealed that the . This was the first medical evacuation in the history of the ISS.

NASA wrote a statement saying that the astronaut experienced an unknown medical event on January 7 “that required immediate attention” from his fellow crew members. Fincke added that his “status quickly stabilized” thanks to the “quick response and the guidance” of the flight surgeons.

However, the incident did force NASA to planned for January 8. Soon after that, the agency announced it would be ending the Crew-11 mission a month early. The four-person crew included Fincke, NASA astronaut Zena Cardman, Japanese astronaut Kimiya Yui and Russian cosmonaut Oleg Platonov.

They had been living and working aboard the ISS since August and were expected to stay until February. The crew returned on January 15, which was a decision made by NASA’s chief health and medical officer. Once the crew had landed, administrator Jared Isaacman said it was a “serious situation” but didn’t go into any detail.

Fincke has said he is currently “doing very well” and still participating in standard post-flight reconditioning at NASA’s Johnson Space Center in Houston. “Spaceflight is an incredible privilege, and sometimes it reminds us just how human we are,” he said. “Thank you for all your support.”

We don’t know what medical issue Fincke is going through, and it’s certainly his business and not ours. In any event, we wish for a speedy recovery.

NASA also to replace the prematurely-returned astronauts. That team docked at the ISS on February 14 and are scheduled to stay on the space station for around eight months.