Five Decades After Prison Break, Man Who Escaped Alcatraz Sends  FBI A Confession

Too Easy

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Chipping away at cement is a difficult task, but the inmates were able to take advantage of the vents in the walls, which provided a starting point. They crawled into the vents and worked from the inside, gradually weakening the cement. The constant moisture surrounding the walls also helped to weaken the cement, making it a bit easier for them to chip away at it.

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