Lusitania sinking

ON MAY 7, 1915 the Cunard ocean liner RMS Lusitania, on its way from New York to Liverpool, was hit by a single torpedo from the German U-boat U-20 eleven miles off the coast of Ireland. The U-boat captain wrote in his log:

Torpedo hits starboard side right behind the bridge. An unusually heavy detonation takes place with a very strong explosive cloud. The explosion of the torpedo must have been followed by a second one [boiler or coal or powder?]... The ship stops immediately and heels over to starboard very quickly, immersing simultaneously at the bow...