It’s hard to remember the last time I wished death on a character as badly as I wished it upon Carl (Ioan Gruffudd). Carl is an unconscionable douchebag; a character so poorly written and acted that to watch him in Sanctum is to experience more agony than any of the characters.
For the most part, that’s how it works in this movie, which is to say nothing really does work. Like last year’s Unstoppable, this is a monster movie with no actual monster. Instead, the lame-duck characters swim their way through an unexplored cave network that slowly but surely claims most of them in a series of unfortunate and completely stupid events. It’s the latest in 3D “event” filmmaking.