Hmmmmmmm.....
I am skeptical re: the 300 foot dive described above. That kind of depth is not for the recreational diver. And visibility in Winnipesaukee is SEVERELY limited at anything below, say, 80 feet (depending on location and other factors). 100+ feet in Winnipesaukee is dark, dark, dark. 300 feet? That's a SERIOUS deco dive, requiring multi-staged decompression -- not a dive that simply "happens," but one that is planned for (carefully). It's more likely in the north Atlantic, among the hard-core wreck diving crowd. Not a lot of that going on on Winnipesaukee. Just an observation.
That being said, I wouldn't doubt holes going way-deep, but I doubt anyone has penetrated them.
Again, this is a question better suited to folks like Winn Diver, and the professionals from Dive Winnipesaukee and Fathom Divers.
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