Mystery of the Kentucky Cave

7th February 2022 45 mins Season 2 Episode 5

Exploring the vast 400-mile Mammoth Cave in Kentucky, USA. Plus, a newly constructed opening into a metal mine in Wales - untouched for over 70 years.

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Season 2 · Episode 6

Ireland's Underground Alcatraz

Exploring hidden defences that have kept Cork Harbour, in Ireland, safe for over 400 years. Plus, a former submarine base in the fjords of northern Norway.

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