I read in a thread some time back that it took several years to find the keyhole restriction.
Is there someplace I can read a history of the exploration of Ginnie? I have read the standard "cave diving" books and have not found a detailed history that I can recall.
I guess I am taking for granted at the ease of going throught the keyhole now at what appears to be a wide open "restriction" that took several years to find?
Can someone fill me in on the early exploration, mapping of Ginnie or point me in the right direction?
Thanks in advance!


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