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Somehow you have ended up below the bottom of the pool. There is no longer a floor beneath you.
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This makes sense, as you swam through the bottom of the floor, and as a result of that, the floor of the pool is now above you.
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You run out of air and reflexively open your mouth. Your lungs fill with water, however, you do not drown.
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It is very dark. You can't see a thing.
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