A big cave, a big soundtrack, and a big adventure. This movie didn't have or need any cave creatures or supernatural threats. It is exciting and suspenseful as a realistic cave story that is based off of a true story. After a storm blocks the way out for a crew of cave explorers, they must go deeper into unexplored areas of the cave in search of a way out. Water is the big threat in this movie. Not only are there numerous underwater passageways to navigate with limited oxygen, the crew is pushed forward by flood waters rising from the storm. While many cave movies keep things dark and claustrophobic, this movie gives us a cave that is both beautiful and impressive in size. The cast is what they need to be to tell this story. There is a storyline about the strained relationship between a father and his son which gets our feelings involved. To further stir our emotions, the soundtrack is lovely and compliments scenes very well. Sanctum is a solid survival movie that is both interesting and exciting. It deserves more love than it has gotten.