In this video, William Gerstenmaier, NASA Associate Administrator for Human Exploration and Operations, discusses the dangers that complacency can cause on a mission or project. He discusses a specific example where water entered an astronaut's space helmet during a spacewalk and caused a dangerous situation. The same problem with water in the helmet had been studied on the ground and was deemed to not be a large hazard. Water had also entered astronaut helmets on previous spacewalks, but did not raise much concern. The operating environment in space had changed the effect that water inside the helmet could have on an astronaut.
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