I disembark and climb up

And you can see through it.
But without light to check the walls/ceiling, I chicken out from going through. Seriously, bats freak me out.
Hours later we find what I think is this window when we kayak entirely around these mountains.

Then we find more caves,...

Photo album generated by album generator from David Ljung's Marginal Hacks on Fri Nov 11 20:40:56 2022