From SciShow.

NASA has been using swimming pools to train astronauts since the 1960s. The largest is the Neutral Buoyancy Laboratory (NBL), which holds roughly 9 olympic pools worth of water and has contained not just mockups of space station and telescope parts, but also the Moon!

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Sources: https://drive.google.com/file/d/1INZ12bhRm8gh1CXJfmx_UWZFG9tBQrsy/view?usp=sharing