Watch Underground Marvels Season 1 Episode 4 online free

Run Time: .

IMDb: IMDb 7.1.

Episode name: Kingdom of Salt .

Air Date: 16 Oct. 2019.

Genre: documentary tv shows.

Episode Info: 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.

Story: British documentary series exploring incredible feats of human endeavour underground, revealing what people have built, where they have built it, how and why. .

Creator: .

Country: .

Cast:

Chris Jarman
Self - Narrator

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Jason Desporte
Self - Caves Historian

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Watch Underground Marvels season 1 episode 4 Online Free,

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