Secrets of the Underground
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.
| Created By | ||
|---|---|---|
| Status | Ended | |
| Original Name | Secrets of the Underground | |
| First Air Date | February 14, 2017 | |
| Last Air Date | December 16, 2017 | |
| Seasons | 2 | |
| Episodes | 16 | |
| Episode Runtime | 1h 0min | |
| Language | English | |
| Original Language | English | |
| Production Countries | United States of America | |
| Production Companies | Science Channel | |
| Networks | Science | |