Claustrophobics beware: you will experience severely confined spaces in this "squirmingly visceral thriller" (Variety) about a group of cave explorers who become hopelessly trapped in a massive underground labyrinth. With a freak cyclone rapidly filling the caves with water, the survivors must navigate a treacherous series of unexplored tunnels in search of a way out. Richard Roxburgh and Rhys Wakefield star as clashing father-and-son spelunkers who find common ground in leading the team to safety.

Also with Alice Parkinson, Dan Wyllie and Ioan Gruffudd. Directed by Alister Grierson; written by John Garvin and Andrew Wight.

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