Here is some information about the late Charles Read:https://en.wikipedia.org/wiki/Charles_Read_(mathematician)It appears his website (although currently not complete) has been archived:https://solocavediver.com/Most of this seems to be about overseas cave diving (he had some good pals in Florida). I've not had time to trawl through exhaustively but you may find something of use if you look through it.Good luck!
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