Secrets of the Underground - Season 1 - Eps 8: American Stonehenge
Rob Nelson investigates the mysterious pattern of rocks at the bottom of Lake Michigan known as Underwater Stonehenge. At the notorious Alcatraz prison, Rob uses state-of-the-art technology in search of rumored escape tunnels.
About Secrets of the Underground
Title: Secrets of the Underground
First Air Date: 2017-02-14
Last Air Date: 2017-12-16
Status: Returning Series
Rating: 4.3/10 (from 3 votes)
Language: EN
Seasons: 2
Total Episodes: 16
Network: Science
Genres: Reality, Documentary
Production Companies: Science Channel
Synopsis
A search for an underground escape route said to have been used by Al Capone. Also: who or what built earthen mounds in Washington state.
