Y-40 “The Deep Joy” (opened on 5 June 2014) is 42.15 meters deep (138 ft).

It contains 4,300 cubic meters of water (1,136,000 US gal)

The water is kept at a temperature of 32–34 °C (90–93 °F).

The pool also has underwater caves and platforms at various depths, ranging from 1.3 meters (4.3 ft) to 12 meters (39 ft).

That is seriously cool!
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Cool!
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Looks like a great place to do some “space” training too.
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Cool but terrifying too!
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Awesome!
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