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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