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Dark Secrets of the Lusitania

The Lusitania at sea.
On May 7, 1915, a well-placed German torpedo struck the RMS Lusitania passenger liner with 1,959 passengers on board. Ultimately, 1,198 of them succumbed to the water. But the ones who survived gave eyewitness accounts of a second, more powerful explosion that to this day cannot be fully explained. A team of scientists at the Lawrence Livermore National Laboratory in California test four distinct theories to explain the cause of this explosion.