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16%
6.4 (190)Age rating
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HD
TV-PG
2 Seasons - 42min
Buy
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 $5.99 / month
Available until
12/31/2029
Runtime
42min
Age rating
TV-PG
Quality
HD
CC
HD
TV-PG
2 Seasons - 42min
Free
retail price
Available until
1/1/2026
Runtime
42min
Age rating
TV-PG
Quality
HD
CC
HD
TV-PG
1 Season - 42min - English
Free with ads
retail price
Available until
1/1/2036
Runtime
42min
Age rating
TV-PG
Quality
HD
Audio languages
English
CC
HD
TV-PG
2 Seasons - 42min
Buy
Starts at $2.99 / Episode
Runtime
42min
Age rating
TV-PG
Quality
HD
CC
HD
TV-PG
2 Seasons - 42min - English
Buy
Starts at $2.99 / Episode
Runtime
42min
Age rating
TV-PG
Quality
HD
Audio languages
English
CC
HD
TV-PG
2 Seasons - 42min
Buy
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, Discovery + or for free with ads on The Roku Channel. It is also possible to buy "Secrets of the Underground" as download 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.
