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6
Documentary
2019
TV-PG
•
45 min.
In broadcast
Historians, engineers, and experts take a look at the underground structures, systems, and phenomena that exist beneath our feet.
Release:
October 17, 2019
Original language:
English
Production country:
United Kingdom
United States
Network:
Producer company:
Phoenix Television
TCB Media Rights
Type:
Documentary
Status:
Returning Series
More information
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Seasons
2
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Season 1
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10 episodes
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Season 2
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10 episodes
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