Ratings
Series Details
Seasons: 2
Total Episodes: 20
Creators:
Networks: Science , U&Yesterday
Status: Returning Series
First Air Date: Oct 17, 2019
Recent Air Date: Oct 7, 2021
Run Time: m
In Production: Yes
Original Language: English
Age Rating: TV-PG
Website: Link
Production Companies: Phoenix Television , TCB Media Rights
Sources:
Genres
Keywords
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Synopsis
Historians, engineers, and experts take a look at the underground structures, systems, and phenomena that exist beneath our feet.