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Secrets of the Underground (2017)
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.
Genres:
Documentary,
Reality
Production companies: Science Channel
Country: United States
Languages:
English
Network: Science
Runtime: 960 min.
Episode Runtime: 60 min.
Released: Feb. 14, 2017
Last Air Date: Dec. 16, 2017, midnight
Status: Returning Series
Certification: TV-PG / 10+
