Olympic-class ocean liner of 29 coal-fired steam boilers in six compartments. However, "Olympic"s boilers were adapted for firing by oil at the end of the First World War, which reduced the number of engine crew required from 350 to 60. The "Olympic"-class ships were long, displacing normally (their draft at this displacement being ), and their tonnage was around 45-46,000 GRT. "Olympic" became the largest ship in the world when it was completed in May, 1911 before losing the title to its sister "Titanic" when she was completed in April, 1912. After the loss of "Titanic" the third sister ship "Britannic" claimed the
Cybele-class mine destructor vessel Cybele-class mine destructor vessel The "Cybele" class was a class of trimaran ships, constructed by the Royal Navy during World War II for the purpose of clearing minefields. Referred to as Mine Destructor Vessels, two ships of the class, and were built in 1944; one was lost following D-Day, while the other survived the war only to be scrapped shortly thereafter. Officially designated as mine destructor vessels, the "Cybele" class was a large trimaran vessel, constructed using a steel lattice truss framework. They were intended to be towed through minefields that used pressure mines, creating a pressure wave that would