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The team learns more about the Rock's caves and tunnels; at Gorham's Cave, secrets are revealed about Neanderthal cousins and their importance to the Ancient Greeks.

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Revealing extraordinary caves with 3D laser-scanning technology.

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The team examines the deepest shaft discovered in the UK: Titan; they hope a 3D scan can reveal its true size and secrets about its formation.

S1 E1 | Great Britain