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Seegrotte, Austria-Europe's Largest Underground Lake and Secret German WWII Airplane Factory

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Added by vindheim
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In 1912, an underground blasting operation in this Austrian gypsum mine went wrong and caused over 5 million gallons of water to flood the mine. During WWII, 2,000 Germans built one of the first jet fighters here. Over 10 million tourists have visited this underground cave and mine.
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