
Grasp diver Frank McGuire (Richard Roxburgh) has explored the South Pacific’s Esa-ala Caves for months. However when his exit is reduce off in a flash flood, Frank’s crew—together with 17-year-old son Josh (Rhys Wakefield) and financier Carl Hurley (Ioan Gruffudd)—are compelled to radically alter plans. With dwindling provides, the crew should navigate an underwater labyrinth to make it out. Quickly, they’re confronted with the unavoidable query: Can they survive, or will they be trapped without end?