I know, SPOILER! But I'm doing you a favor--skip this movie unless you have a life mission to see every movie that's ever been made about caves. And even then, you're probably better off watching The Descent again.
I really want to emphasize that not only did a lot of people drown in this movie, but that number includes 2 suicide drownings, 3 forced drownings, and one foiled forced drowning. And this was in 3D!
