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In Underworld: Great Britain 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.

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In Underworld: Gibraltar the team learns more about the Rock’s caves and tunnels. At Gorham’s Cave secrets are revealed about our Neanderthal cousins and their importance to the Ancient Greeks.

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Underworld: Slovenia is an adventure into Slovenia’s largest ice cave. The team scans the volume of ice providing data for scientists to assess climate change.

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In Underworld: Belize the team discovers why the Maya Civilization vanished. In the cave of Actun Tunichil Muknal they uncover the remains of human sacrifices. Professor Holley Moyes reveals how a drought caused the Maya to venture underground to make human sacrifices as they prayed for rains.

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Underworld: China uncovers the secrets of China’s giant caves. A team maps Cloud Ladder Hall showing how its size creates an underground weather system.

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