Astronauts Perform Last Spacewalk to Prepare ISS for Commercial Flights

Expedition 42 Commander Barry Wilmore and Flight Engineer Terry Virts, nicknamed "cable guys" by the media, are scheduled to lay 400 feet of cable along the ISS main truss and install antennas as part of the new Common Communications for Visiting Vehicles (C2V2) system, according to NASA. They have already conducted two successful spacewalks in February.

The astronauts venture into space four days after Virts reported a water leak in his helmet at the end of the previous spacewalk. Mission managers said the issue was not a concern and allowed the astronauts" to proceed as planned.

The spacewalk is expected to last nearly seven hours. European Space Agency astronaut from Italy Samantha Cristoforetti is helping Wilmore and Virts from inside the station.

The current ISS crew comprises six people from the United States, Russia and the European Union. Three cosmonauts from the Russian Federal Space Agency (Roscosmos) include Elena Serova, Alexander Samokutyaev and Anton Shkaplerov.