The document summarizes details about 5 sunken ships - Olympic, Titanic, Britannic, Poseidon, and Lusitania. The Olympic collided with another ship near Southampton. The Titanic sank on its maiden voyage after hitting an iceberg in the North Atlantic, resulting in many casualties from the cold water. Britannic, the sister ship of Olympic and Titanic, sank after being struck by a German bomb while serving as a hospital ship during WWI. Poseidon capsized after being hit by a large wave, with only 6 survivors. Lusitania, one of the largest ships built before Titanic, was torpedoed by a German U-boat while transporting weapons during WWI