Horror Some people explore a cave in a mountain. I think under a church like building on the side of a mountain in Tibet or Thailand or something. In the caves there are I think sailors trapped a long time ago who evolve into fish looking like monsters and live in the caves walls/ rocks. This is a fairly modern movie maybe no more than 10 years old
The Descent (2005)?
Dagon?
“The Cave”(2005)?
Trailer posted below.
https://youtu.be/QP4DsyaB1eE