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The total number has not been compiled, but new ones are being found as time goes on. The Marianas Trench has yet to be fully explored.

In answering a similar question, my quick assessment by index of two of my cavers' guide-books showed a total of over 500 in just two of the UK's several limestone regions - and one of those books listed only the more significant 60 out of many more in its own area.

Yes, caves are still being discovered as you say, but not in the seas with a few exceptions of those drowned by sea-level rise since glacial times. They won't be in ocean depths though.

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12y ago

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