Plot — What is Secrets of the Underground about?
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.
▶ Secrets of the Underground — Official Trailer
Streaming Availability
You can currently stream Secrets of the Underground on:
PhiloDiscovery+ Amazon ChannelDiscovery +
Quick Facts
| Type | Web Series |
| First Aired | 2017 |
| Genre | Reality, Documentary |
| Language | English |
| Seasons | 2 (16 episodes) |
| Audience Score | 54% (5.4/10, 5 votes) |
Secrets of the Underground — FAQ
Is Secrets of the Underground worth watching? Secrets of the Underground holds a 5.4/10 rating from 5 viewers. 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.
Where can I stream Secrets of the Underground? You can stream Secrets of the Underground on Philo, Discovery+ Amazon Channel, Discovery +. Availability may vary by region.
When did Secrets of the Underground release? It first aired in 2017.
