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If you turn a glass upside down and push it down into water, does water rise to fill the cup? No, the air in the cup is trapped like a big bubble, and has nowhere to go.

Makes sense. Pretty cool. I thought it was a screenshot from a video game at first. So amazing and unreal that this is actually real.

70% of the planet is still mostly unused. As technology improves and the need for more food, metals and energy increases we're naturally going to have to expand into the sea in a big way to obtain those things.