What is the biggest or deepest underwater cave in the world?
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jonnythan once bubbled...
3 and a half miles.
This is why DIR was invented.
http://wkpp.org/articles/Exploration/18grand1.htm
LUBOLD8431 once bubbled...
Johnnythan, I know you are young and dont get out much, but DIR (the Hogarthian style of diving specifically) was around way before this dive...
Sorry to bust on your little parade...