The Descent (2005, UK)

The Descent is essentially The Cave with girls. But, unlike The Cave, it’s genuinely creepy and actually worth ninety minutes of your life. Six friends, one of whom is still reeling from a horrific car crash that claimed her husband and young daughter, go caving in the middle of nowhere, only to discover that all sorts of nasty things hide underground. It’s not particularly genre-busting or psychologically deep, but it’s a monster movie done well – one that recognizes that the scariest kinds of monsters aren’t necessarily those that prey on human flesh.