Sanctum 2011 (on netflix)
6.5/10
If you like exploration & survival films, & the like: cave or underwater films, I think you'll enjoy this. It's what I'd call "reality horror", or just plain a personal disaster film (like your own personal Towering Inferno).
I think it was well shot & well made. Good cinematography, sets, sounds. The acting is solid when you accept the characters are a mix of hard-ass explorers, Xtreme sporters, survivalists & rich asshole types. Realizing that, I thought the stoicism was mildly realistic character development, enough for the type of film it's trying to be (it's not Terms of Endearment).
Most of the scenes are very real, and the rest plausible -- in that area of 'who knows unless you're in that extreme situation' plausibility.
Looking at the ratings & reviews at large, I think most are being awfully harsh; as if they were expecting 'James Cameron's Titanic' in a cave. Cameron didn't write or direct it, he just funded it.