Underground Worlds

6:10 AM to 7:10 AM
Wednesday 18 September
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Mystery of the Kentucky Cave

Season 2 Episode 5 of 10

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

Underground Worlds airs on U&Yesterday HD at 6:10 AM, Wednesday 18 September. (Subtitles, audio description.)
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