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Verëvkina Cave in Abkhazia, the deepest known cave in the world, reaching 2212 m deep.
(upload.wikimedia.org)
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Is that the end of the cave at the very bottom, or is it just the level wehere water starts and it could be possibly deeper?
At least the siphon with the lowest surface level was measured, but it does not say if by diving one could get even deeper.
Potentially goes deeper.