I’ve seen the entrance to caves at about 80 feet. One had a sign with a skull and crossbones on it. The text said ‘stop or you will die’.
People without training still went past the sign, and yes some of them die.
I live over in Spring Hill a few miles from there. The Darwin Awards should set up a field office at the cave entrance. The father might have figured it was safe to go down their because the underground water levels are low, (one reason, they say that their’s been sinkhole activity in the region.) Well this is a tragic example of why a little knowledge is dangerous
One of the side effects of all the "idiot warnings" on too many things is that some people routinely ignore all warnings.