Super Tunnel

NOVA

12th October 2016 55 mins Season 44 Episode 4

Join engineers as they build a massive new railway deep beneath the streets of London.

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Season 44 · Episode 5

Treasures of the Earth: Gems

Gemstones like diamonds, rubies, opal and jade are the ultimate treasures. Delve into Earth's depths to discover how these precious stones are forged and what explains the unique allure of each captivating gemstone.

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