International Space Station: Inside the Moments After Astronauts Evacuated

A suspected gas leak promoted astronauts to evacuated to Russian section of ISS.

Speaking to ground control, Commander Butch Wilmore said the team had powered down non-essential equipment and was working to find out what prompted the early morning alarm.

Overnight, Mission Control at NASA's Johnson Space Center in Houston saw an increase in cabin pressure, which in a worst-case scenario, can be indicative of an ammonia leak, according to NASA.

Samantha Cristoforetti, an Italian astronaut who is on her first mission at the International Space Station, tweeted that the group was doing well and spending the day in the Russian segment.

It's not immediately known how long the astronauts will have to bunk in the Russian segment of the station, however Astronaut James Kelly at Mission Control gave them one piece of advice:

"Enjoy your impromptu day off."