Last Sunday marked the completion of three spacewalks outside the International Space Station as two U.S. astronauts prepared parking spaces for new space taxis that will arrive in a few years.

The duo, ISS commander Barry "Butch" Wilmore and Terry Virts, completed tasks including installing antennas and cables along with navigation aids on the space station's exterior truss. This final spacewalk was completed in just 5.5 hours.

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This series of spacewalks was to ensure and prepare berthing slips for spacecraft being built by Boeing and SpaceX.

Wilmore and Virts shortly floated into space outside the Quest spacelock after 7:00 A.M. EST. Their mission was to install and configure more than 400 feet of cables and some reflectors the new spaceships will use for navigating toward the dock of the space station.

After successfully completing this third spacewalk, Virts reported a small amount of water seeped into his helmet. This malfunction also occurred last week during a spacewalk. This isn't the first time water leaked into an astronaut's space suit.

In July 2013, Luca Parmitano nearly drowned inside his space suit during a spacewalk when water began leaking into his helmet. NASA mission control aborted the spacewalk and suspended all scheduled spacewalks so engineers to figure out the root of the problem. The suit Virts was wearing was not the cause of the water leak, says NASA.

This Sunday's spacewalk was the last one following two spacewalks last week that rigged power and data cables for docking port adapters slated to arrive later this year.

These docking port adapters will be used by the new commercial space taxis from private U.S. space companies that will transport crew to the space station. To date, the U.S. has been dependent on Russian spacecraft to transport crew back and forth to the station since the space shuttles' retirement in 2011.

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