I can't figure it. Bringing down any necessities of survival on ropes every day, or every few days?

A big mystery for me is the fact that those wooden poles are still intact. This thing is not some thousand-year-old ruin.

I've not had much experience in caving. Visited Carlsbad Caverns, and I and some other Boy Scouts once camped out at Sitting Bull Falls state park, a few miles away as the crow flies, where there are some caves to be explored. Sort of sketchy, stuff can go wrong.

But I kept thinking about the Tom Sawyer's cave phenomenon, where there were underground passages that connected with other rooms. Perhaps 1 million years of water trickling through a mountain side would carve out passages to a place where the water escaped.

At Sitting Bull Falls The main attraction is a small waterfall in the middle of the desert. Maybe 150 feet high and a cave in the rocks behind the fall, with a creek at the back of the cave disappearing underground. Sort of like in Tarzan movies. The cave was accessible by steps cut in the rocks.

If the cave in our video were similar, there would be a full-time water supply. Groundwater running year-round. High enough at certain times of the year to flow out of the opening of the cave.

That's my vote, underground passage access. Somebody found it by accident.

__________________
1986 300SDL, 362K
1984 300D, 138K