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Holy shit this thread is bonkers. Im a florida-fag so I was taught from birth to stay the fuck out of holes more than 5 feet deep because they WILL get saturated with groundwater and collapse. With the only way of getting out is in various pieces via backhoe.
How do you gauge which holes are cool and which are danger-these-will-kill-you if you knock a rock loose. Sounds? Moisture/rock type? Just get a feel by going in enough?