Definitely a cave, or what we used to call cave-ish, which really is the same thing as a karst spring.
If there is fish, it probably means it is active (running water from somewhere) and may likely join up to any creeks or rivers in the nearby proximity.
If it is your land, and you want it explored, you can get in touch with your local "Grotto" of the National Speleological Society (NSS) - the US caving Society. and they are very respectful and keep locations secret. However... the best way to keep a secret is to not tell anyone, so don't go the NSS route.
Be very careful, as 'virgin' caves can have a lot of loose rock on the walls and ceiling, where boulders just get delicately left by erosion/water, and these things can get disloidged just by bumping them. If you go in, be very cautious the first few times, and look closely for loose rubble, especially on the roof. Either knock it down, or back out slow.
Best advice for exploring is to actually join the NSS (even if you don't tell them about your cave), and learn from the experts. It's not a thing you want to learn by trial and error.
There are many divers in the NSS (and Canada) who would jump at the chance to take their scuba gear into that hole with a drysuit and a rebreather!
All in all, a very cool find.
Last edited by bergman; 03-18-2016 at 05:28 PM.
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