Spacewalking astronauts have added another parking spot to the International Space Station.
Nasa astronauts Nick Hague and Andrew Morgan had to deal with multiple cables to install a docking port delivered by SpaceX last month.
It will be used by SpaceX and Boeing once they start launching astronauts to the orbiting lab late this year or early next year.
This is the station’s second docking port for commercial crew capsules. The first was installed three years ago. The newest port replaces one that was destroyed during a SpaceX launch accident in 2015.
It was the third spacewalk for Mr Hague and the first for Dr Morgan, an army medic who moved into the station a month ago.
“Docs rock,” Mission Control radioed to Dr Morgan as the spacewalk got under way.
The astronaut in Houston communicating with the spacewalkers — who is also a doctor — added: “Welcome outside.”
Ever since its space shuttles retired in 2011, Nasa has been limited to Russian rockets for getting astronauts to the space station.
While US commercial deliveries have been running smoothly since 2012, crew flights from Cape Canaveral remain on hold.
SpaceX launched its first crew Dragon capsule with no one aboard in March. The capsule was destroyed the following month during an engine test in Florida.
Despite the setback, SpaceX still aims to squeeze in its first test flight with astronauts by the end of the year.
Boeing intends to launch its Starliner capsule without a crew this autumn, followed by a test flight with a crew some time early next year.