(CNN) -- Discovery astronauts Steve Bowen and Alvin Drew are scheduled for a six-hour spacewalk outside the international space station Monday. The team prepared by holding a 14-hour "campout" in the station's Quest airlock. "The airlock's atmospheric pressure will be lowered to help purge nitrogen from Bowen and Drew's bloodstreams, protecting them from 'the bends' when they leave the airlock for the vacuum of space," a statement on NASA's website said. They will install a power extension cable, move a failed ammonia pump and perform other operations outside the shuttle during the spacewalk. Discovery started its 39th and final flight with a launch late Thursday afternoon from Kennedy Space Center in Florida.
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Astronauts are preparing for a spacewalk with a 14-hour "campout"
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A night in the space station's airlock will ready astronauts for the vacuum of space
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Discovery was the first space shuttle to dock with the space station in 1999
Astronauts spent Sunday moving items brought up on @placeholder over to the space station.