White Star Line "Olympic" class were to be the biggest and most luxurious ships in the world. The "Olympic" was the only ship of this class that was profitable for White Star. "Titanic" sank on her maiden voyage, while "Britannic" was requisitioned by the British government before she was fully fitted, and used as a hospital ship during World War I. "Britannic" hit an underwater mine, in the Kea Channel off the Greek island of Kea, and sank on the morning of 21 November 1916. Like many other shipping lines, the White Star Line suffered heavy losses during the First World War which
Sister ship Sister ship A sister ship is a ship of the same class or of virtually identical design to another ship. Such vessels share a nearly identical hull and superstructure layout, similar size, and roughly comparable features and equipment. They often share a common naming theme, either being named after the same type of thing (places, constellations, monarchs) or with some kind of alliteration. Often, sisters become more differentiated during their service as their equipment (in the case of naval vessels, their armament) are separately altered. For instance, the U.S. warships , , , and are all sister ships, each being