How NASA prepares astronauts for the weightlessness of space

Space · Published 19 October 2026 Swipe more like this →

In short: Step inside the Neutral Buoyancy Laboratory to see how safety divers and flight doctors use underwater simulations to replicate the experience of working in orbit.

Astronaut Mike Massimino examines Johnson Space Center training procedures during this NASA Behind the Scenes installment. The video examines how underwater environments are used to compare spaceflight conditions to Earth-based training. Additionally, members of NASA's shuttle closeout crew explain the technical process of securing astronauts into their seats prior to liftoff.

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