Secrets of the Underground (series)
- User score: 4.3
- Production country: United States of America
- Production companies: Science Channel
- Genre: Reality, Documentary
- Release date: 2/14/2017
- Release date of last episode: 12/16/2017
- Series status: Returning series
- Seasons count: 2 ( List of episodes )
- Episodes count: 16
- Run time: 60 min.
Series description
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.
