RMS Niagara was a transpacific steam ocean liner, Royal Mail Ship and refrigerated cargo ship. She was launched in 1912 in Scotland and sunk in 1940 by a mine off the coast of New Zealand. Her regular route was between Sydney and Vancouver via Auckland, Suva and Honolulu. In her 27-year career she made 162 round trips between Australia, New Zealand and Canada and sailed nearly . Niagara was owned firstly by the Union Steam Ship Company of New Zealand (popularly known as the "Union Company"), and later by the Canadian-Australasian Line, which was jointly owned by the Union Company and Canadian Pacific. Like many Union Company ships, she was registered in London in the United Kingdom. Niagara was built to burn either coal or oil. She was the first oil-burning steamship to be certificated by the Board of Trade to carry passengers. When new, Niagara was the largest merchant ship yet owned by a New Zealand company. In 1914 and 1915 she set a number of speed records for crossing the Tasman Sea. In 1918 Niagara was instrumental in the spread of Spanish flu to New Zealand. When she was sunk in 1940, Niagara was carrying about 8 tons of gold bars. Divers recovered 555 bars in 1941, and another 30 in 1953, but five gold bars remain unaccounted for. Niagara was bunkered with oil when she sank. Heavy fuel oil has leaked from her bunker tanks ever since, and has caused some environmental damage in and around Hauraki Gulf. Some oil remains in her wreck, and the scale of environmental threat it may pose continues to be debated. Building John Brown & Company built Niagara in Clydebank, Glasgow. Laura Borden, wife of Canadian Prime Minister Robert Borden, launched her on 17 August 1912. Niagara was completed in March 1913. She was long, her beam was and her tonnages were and . Some of Niagaras holds were refrigerated for perishable cargo. When she was new, her number one (forward) hold was not refrigerated. When new, Niagara was the largest ship in the Union Company's fleet and the largest ship owned by a New Zealand company. Before she was launched, Niagara was nicknamed "The Titanic of the Pacific". After RMS Titanic sank in April 1912 this was changed to "The Queen of the Pacific". Propulsion Niagara had three screws. Her port and starboard screws were each driven by a four-cylinder