The Descent (2005)

enjoyableyes
spookyyes
scaryyes
unsettlingyes
goreyes
body horrorno
violence toward animalsno
Bechdel-Wallace testpassed
Mako Moripassed
X was the real YIt turns out humanity was the real caves.

Being trapped in confined spaces is definitely the premise I find scariest.

Luckily, I had seen this before so I got to watch coworkers get scared instead.