A commercial Dragon cargo capsule will remain at the International Space Station until Saturday, three days later than previously planned due to high sea states observed by the SpaceX recovery team in the spaceship’s splashdown zone in the Pacific Ocean.

A United Launch Alliance Atlas 5 rocket blasted off from Vandenberg Air Force Base in California at 5:49 a.m. local time (8:49 a.m. EDT; 1249 GMT) Thursday on the classified National Reconnaissance Office NROL-55 mission.

Watch a zoomed in view of the Falcon 9 rocket with the first Crew Dragon capsule atop, briefly fire its engines for a crucial pre-launch test on Jan. 24, 2019 at launch pad 39A at the Kennedy Space Center.