White Star Line naval mine, while in service as a hospital ship. "Britannic" was the largest loss for the company, and also the largest ship sunk during the conflict. 1916 also saw the loss of the liner "Cymric" which was torpedoed off the Irish coast in May, and also of the cargo ship "Georgic", which was scuttled in December with its cargo of 1,200 horses still on board, after being intercepted in the Atlantic by the German merchant raider . 1917 saw the loss of the liner "Laurentic" in January which struck a mine off the Irish coast and sank with the loss
Sister ship American sister ships and , and the German Hindenburg class airship's "Hindenburg" and "Graf Zeppelin II". The generally accepted commercial distinctions of a "sister ship" are the following: The critical overriding criteria are the same hull design. For example, the popular TESS-57 standard design built by Tsunishi Shipbuilding are built in Japan, China, and the Philippines. All the ships of this design are classed as "sister ships". The International Maritime Organization defined "sister ship" in IMO resolution MSC/Circ.1158 in 2006. Criteria included these: Sister ship A sister ship is a ship of the same class or of virtually identical design