On May 7, 1915, the RMS Lusitania, was on a New York-to-Liverpool run when it was attacked by a German U-boat 12 miles off the coast of Ireland. At 2:10 p.m., a torpedo plowed into the ship and exploded. Fifteen seconds later, a massive second explosion rocked the ship again. Within a mere 18 minutes, the Lusitania plunged 300 feet to the bottom of the Celtic Sea. Of the 1,959 passengers and crew, 1,198 were lost, including 128 Americans. The tragedy sparked anti-German fervor that eventually drew the United States into World War I.
Second Explosion theory – Ammunition on board in the form of up to 4 million .303 bullets, probably made by Remington in America and intended for the British Army. Ammunition that for decades British and American officials said didn’t exist.