Folder: Underworld Page 1 of 3

In a salt mine at Tarthun, near Schonebeck, advancing American forces uncovered in 1945 this german underground jet plane factory. In this room, an assembly line for the Heinkel He 162's, worked 2400 persons, mostly slave laborers.

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Workers, Guards and Management Staff of the Borralha Wolfram Mines, Montalegre, Portugal, 1918.

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Hawthorn ridge mine explosion, July 1st 1916

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Félix Nadar, Catacombes de Paris, 1861

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Félix Nadar, Égouts de Paris, 1861

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Construction of the Subway Tunnel under 6th Ave., New York, 1939. Photo: Bob Seelig/New York Daily News

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The Beach Pneumatic Subway Tunnel under Broadway, 1873. New-York Historical Society # 70265 In 1869, folowing the use of pneumatic tubes for postal communication, Alfred Ely Beach started…

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Construção da Barragem de Picote, no Douro Um dos seus vários túneis (1956?)

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Entrance to cave. Vavau. Postcard,  unknown source.  

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Etna Athanasius Kircher, Mundus subterraneus (1664)