When did Underground Worlds Season 1 Episode 4 air?
Underground Worlds Season 1 Episode 4 aired on October 16, 2019.
Underground Worlds
British documentary series exploring incredible feats of human endeavour underground, revealing what people have built, where they have built it, how and why.
Season 1 · Episode 4
Kingdom of Salt
Oct 16, 2019·45m
The Wieliczka Salt mine in Poland, some 327 meters deep, where the voids left behind from excavating salt have been transformed into extraordinary spaces, carved by hand.
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Direct answers for episode-level questions and details.
How long is Underground Worlds Season 1 Episode 4?
This episode runs for approximately 45 minutes.
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