A rare glance into the heart of a German U-boat

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The following images, provided by Tyne & Wear Archives, show the heart of a World War I German submarine that sank in 1918 after it was rammed by a torpedo boat destroyer.

During World War II, Germany built 1,162 destructive "U-boats," which is short for the German word "Unterseeboot," or undersea boat. By April 1917, some 430 Allied and civilian vessels were sunk by German U-boats.

Click here for a series of detailed shots of the vessel.