When NASA astronauts train for moonwalks, they don't start on the lunar surface — they often begin underwater. For decades, NASA's Neutral Buoyancy Laboratory (NBL) has been the premier training ...

"One, two, three," counts Sara García Alonso, looking at her fellow astronaut Amelie Schönenwald before both fall backwards from the life raft into the water. With a hiss their life jackets inflate, ...

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