The near drowning of a space-station astronaut from water that had collected in his helmet during a spacewalk stemmed from acceptance of unusual conditions known to increase risks.
Saturday's spacewalk -- part of a potential trio to replace a failing plump -- went well.
Two astronauts removed an old space station pump Saturday, well ahead of schedule. That task had been planned for the next spacewalk on Monday.
Astronauts aboard the International Space Station are now scheduled to conduct three spacewalks to replace a malfunctioning coolant pump on the station's exterior.
Three of the six current space station crew members moved a Soyuz spacecraft to a new docking port Friday to make room for another spaceship, which is set to arrive on Thursday with three additional astronauts
Expedition 36 to the International Space Station landed in Kazakhstan on Wednesday, after spending 166 days in space.