10565.
+6728
17%
6.4 (190)
Age rating
CC
HD
TV-PG
2 Seasons - 42min
Starts at $2.99 / Episode
Runtime
42min
Age rating
TV-PG
Quality
HD
CC
HD
TV-PG
2 Seasons - 42min - English
7 Days Free
Then $5.99 / month
Runtime
42min
Age rating
TV-PG
Quality
HD
Audio languages
English
Subtitle languages
English
PROMOTED
CC
HD
TV-PG
2 Seasons - 42min - English
7 Days Free
Then $5.99 / month
Runtime
42min
Age rating
TV-PG
Quality
HD
Audio languages
English
Subtitle languages
English
CC
HD
TV-PG
2 Seasons - 42min
7 Days Free
Then $28.00 / month
Available until
1/1/2026
Runtime
42min
Age rating
TV-PG
Quality
HD
CC
HD
TV-PG
2 Seasons - 42min - English
retail price
Runtime
42min
Age rating
TV-PG
Quality
HD
Audio languages
English
Subtitle languages
English
CC
HD
TV-PG
2 Seasons - 42min
retail price
Available until
1/1/2026
Runtime
42min
Age rating
TV-PG
Quality
HD
CC
HD
TV-PG
1 Season - 42min - English
retail price
Runtime
42min
Age rating
TV-PG
Quality
HD
Audio languages
English
CC
HD
TV-PG
2 Seasons - 42min
Starts at $2.99 / Episode
Runtime
42min
Age rating
TV-PG
Quality
HD
CC
HD
TV-PG
2 Seasons - 42min - English
Starts at $2.99 / Episode
Runtime
42min
Age rating
TV-PG
Quality
HD
Audio languages
English
CC
HD
TV-PG
2 Seasons - 42min
Starts at $2.99 / Episode
Runtime
42min
Age rating
TV-PG
Quality
HD
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Currently you are able to watch "Secrets of the Underground" streaming on Discovery+ Amazon Channel, Philo, Science Amazon Channel or for free with ads on The Roku Channel. It is also possible to buy "Secrets of the Underground" as on Apple TV, Fandango At Home, Amazon Video.
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.
