A SpaceX spacecraft has lifted off to rescue two astronauts stranded at the International Space Station (ISS) due to technical issues.

NASA astronaut Nick Hague and Russian astronaut Aleksandr Gorbunov took off on Saturday from Cape Canaveral, Florida to bring back Suni Williams and Barry Wilmore.

The Dragon spacecraft, operated by SpaceX, the private company founded by billionaire Elon Musk, is set to arrive at the ISS on Sunday.

Originally, astronauts Zena Cardman and Stephanie Wilson were set to be part of NASA’s SpaceX Crew-9 mission.

However, they gave up their spots to accommodate Williams and Wilmore, astronauts stranded on the ISS due to technical issues with the Starliner spacecraft.

Williams and Wilmore were originally scheduled to return to Earth on June 13, after their Boeing Starliner capsule launched its first crewed flight from Florida’s Cape Canaveral Space Force Station on June 5. But the Starliner had been plagued with issues, even before the June 5 launch. A previous launch attempt was scrapped on June 1 just moments before launch because of a ground control computer performance issue.

During the 25-hour flight to the International Space Station, the spacecraft experienced several helium leaks and a malfunctioning thruster. Then, when the Starliner arrived on June 6 and attempted to dock at the ISS, four more of the 28 thrusters malfunctioned causing the ship’s arrival to be delayed.

Saturday’s launch of NASA’s mission had been delayed for several days due to the effects of Hurricane Helene. Weather concerns persisted until the last minute, with rain and storms posing risks to the mission.

“The crewmates will conduct more than 200 scientific investigations, including blood clotting studies, moisture effects on plants grown in space, and vision changes in astronauts during their mission,” read a NASA statement.

Williams and Wilmore are expected to return to Earth in February 2025, along with Hague and Gorbunov.