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The secret weapon of the confederate army: the Hunley

The Hunley was the first submarine ever to sink a ship of the enemy. During the American civil war (1861-1865) the confederate army used the Hunley to break the blockade of the Union marine. However, after the first successful mission the Hunley sunk to the bottom of the sea. In 1995 the submarine was located and in 2000 it was recovered. The circumstances of the sinking of the Hunley have remained a mysterie for a long time. This documentary of National Geographics explains what might have brought the Hunley down.