Chris Hadfield during training for STS-100

1 December 2000 - Both attired in training versions of the extravehicular mobility unit (EMU) space suit, astronauts Scott F. Parazynski (left) and Canadian Space Agency astronaut Chris A. Hadfield stand on a platform that will ease the two STS-100 mission specialists into a giant pool of water at the Neutral Buoyancy Laboratory (NBL). Minutes later, the two were in a neutrally buoyant state beneath the surface rehearsing space walk duties scheduled for next year's visit to the International Space Station (ISS). (Credit: NASA)