Their capsule undocked from the orbiting lab Monday and is scheduled for splashdown at 5:31 a.m. Tuesday. Watch live here.

Axiom 4 astronauts returned to Earth on Tuesday following their 18 day mission aboard the International Space Station.

“Dragon and the @Axiom_Space Ax-4 crew are on track to reenter Earth’s atmosphere and splash down off the coast of San Diego at ~2:31 a.m. PT tomorrow. Dragon will also announce its arrival with a brief sonic boom prior to splashing down in the Pacific Ocean,” SpaceX posted.