@Ying: The
Olympic (shown in Carl's pic) never sank; it was damaged in 1911 when it collided with a British warship, but otherwise it had an extremely successful career. It survived World War One, unlike its sister ship, the
Britannic, which sank off the coast of Greece in 1916 after hitting a mine, becoming the largest ship to sink during the war. Ironically, the
Britannic was technically the safest of the
Olympic-class vessels, as most of the construction on it was done after its infamous sister sank from hitting an iceberg. That allowed many new safety features to be implemented; and they worked well enough that if the on-board nurses hadn't left most of the lower windows open, it would have survived - because the portholes were open, water was able to pour through into the next few compartments, exceeding the ship's limit of six (as opposed to the
Titanic's 2-4). Near the end of the war, the
Olympic actually managed to sink a German submarine; it also apparently survived a direct torpedo hit from around that time. It was eventually scrapped in the late 1920s/'30s when rivals White Star and Cunard were forced to merge as a result of the Great Depression.