It's not for me, that's for sure! Was watching a Discovery Channel program on caving a while back and there was this hole in the cave floor with a diameter no bigger than the wastebasket sitting on the floor here by my computer. And this fool just goes right into it headfirst! Everybody on the show was worried about him; they had no idea how deep the hole was, whether it narrowed down to a straw twenty feet down, whether it was full of water thirty feet down, whether it had a hairpin turn in it he wouldn't be able to negotiate, etc. What idiots! What reckless idiots, lol!
But he went into it right after the narrator talked about another guy who had died doing something similar; this fellow had gone in, got to a point where he couldn't go forward any further and couldn't back up either. The hole had narrowed and squeezed his chest. He couldn't breathe and died.
Fortunately, the guy on Discovery didn't die. But cavers are nuts!