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Ten years ago Don Shirley and his friend Dave Shaw were diving in Bushman's Hole, South Africa, one of the world's deepest submerged freshwater caves, when they made an unexpected discovery - the body of another diver. Resolving to bring the lost diver home, they mounted a recovery operation to retrieve the body, but things began to go wrong when at 250 metres Don's equipment failed and he found himself in a 12 hour struggle for survival underwater, in the dark.