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6 Seasons
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S4 E7 5/16/19

Alien Hell Portal

The secret purpose for a complex of tunnels at a mansion are revealed.

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Discovery Exploration

Seasons

Episode   1

World's Strangest Ghost Towns

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Secret of Supervillain Island

Episode   3

Escobar's Castle

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Labyrinth of the Dead

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Treasure of Outlaw Valley

Episode   6

Alaska's Fort Apocalypse

Episode   7

Alien Hell Portal

Episode   8

Pompeii's Gate to Hell

Episode   9

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