National Geographic: Last Voyage of the Lusitania

Why did Germany torpedo the Lusitania, a civilian vessel? And why did such an enormous ship sink so fast? Now, take a high-tech plunge beneath the Irish Channel and relive on of the century's most mysterious maritime tragedies: The date is May 7, 1915, just nine months into World War I. A German U-boat torpedoes the Lusitania — one of than largest and fastest luxury liners in the world. Of the 1,959 people aboard, including millionaire Alfred Vanderbilt, nearly two-thirds will die. Many are trapped inside as the great ship sinks in just eighteen minutes.

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