Sanctum (2011)

Handling

Sanctum is a 2011 action-thriller about an underwater cave diving team that faces a life-threatening crisis during an expedition to the unexplored and least accessible cave system in the world. Trapped caving enthusiasts navigate a treacherous series of unexplored tunnels in a harrowing pursuit of a way out. The film follows the group as they deal with this intense situation while exploring the deep caverns.