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there is a partially underwater prison near the capital of Estonia that is a popular diving spot. The lake under which it is submerged was the quarry where the prisoners worked when the prison was operational. When it was abandoned the groundwater submerged it.

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Fun Fact: there is a partially underwater prison near the capital of Estonia that is a popular diving spot. The lake under which it is submerged was the quarry where the prisoners worked when the prison was operational. When it was abandoned the groundwater submerged it.

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atlasobscura.com

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