Underground Worlds

6:10 AM to 7:10 AM
Tuesday 17 September
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Cincinnati's Secret Caverns

Season 2 Episode 3 of 10

Exploring the forgotten underworld hiding beneath the streets of Cincinnati, USA. Plus, a state-of-the-art Cold War fortress on the shores of Denmark

Underground Worlds airs on U&Yesterday HD at 6:10 AM, Tuesday 17 September. (Subtitles, audio description.)
Topics
News ➝ Current Affairs
Documentary