Already strapped into their capsule, the four astronauts awaited a final decision, which came down with less than an hour remaining in the countdown.

Musk has been working to retrieve the astronauts after they were left behind on the ISS due to malfunctions with their original ride home, Boeing’s Starliner capsule.

Two U.S. astronauts who have been stuck in space for nine months will have to wait at least a few days longer to return home.