March 2, 2015 2:47 AM EST

Two U.S. astronauts left the International Space Station on Sunday for a spacewalk — the third time they had left the orbiting station in just over a week.

This time, station commander Barry “Butch” Wilmore and flight engineer Terry Virts were preparing berthing docks for space taxis being developed by Boeing and SpaceX, reports Reuters.

Their job was to rig more than 122 meters of cables for two sets of antennas that the new vehicles will use as navigation tools before they dock at the station. The mission was completed after just 5.5 hours, less than the seven hours originally planned on.

After the spacewalk, Virts found a small amount of water inside his helmet but said it didn’t pose a risk to his safety.


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