The launch from Cape Canaveral Space Center in Florida on Saturday delivered a Crew Dragon spacecraft to the ISS, where Nasa astronauts Butch Wilmore and Sunita Williams have been stranded since their Boeing Starliner craft malfunctioned and was forced to return to Earth empty earlier this month.

Two astronauts relinquished their seats on a four-person spacecraft so that their colleagues could return to Earth from the ISS, where they’ve been stuck since June.

After their weeklong journey turned into a monthslong stay on the International Space Station, two Boeing Starliner astronauts will soon be united with the spacecraft that will eventually bring them home.