|Owner:||Union Steam Ship Company|
|Builder:||John Brown & Company, Clydebank|
|Launched:||17 August 1912|
|Fate:||Sunk by mine, 19 June 1940|
|Length:||524.7 feet (159.9 m)|
|Beam:||66.3 feet (20.2 m)|
|Draught:||28 feet 1 inch (8.56 m)|
|Depth:||34.5 feet (10.5 m)|
|Propulsion:||Two triple-expansion engines; one low-pressure turbine; three screws|
|Speed:||17 knots (31 km/h)|
|Capacity:||290 1st, 223 2nd, and 191 3rd class passengers|
RMS Niagara was an ocean liner launched on 17 August 1912 and owned by the Union Steam Ship Company intended for the Australia-Vancouver, Canada service. She was nicknamed "the Titanic of the Pacific", but after the sinking of the real RMS Titanic this was dropped in favour of "Queen of the Pacific". She should not be confused with an earlier RMS Niagara, an ocean liner built in 1848 for the Cunard Line.
On 19 June 1940 she was under the command of Captain William Martin and had just left Auckland when, off Bream Head, Whangarei at 3.40 am, she struck a mine laid by the German auxiliary cruiser Orion and sank in 121 metres (70 fathoms) of water at 5.32 am. The mines were part of an extensive field of moored contact-type mines laid by the Orion on the night of 13–14 June, and a further three mines were disposed of by minesweepers in the area.
No lives were lost, and the few injuries were minor. Abandoning of the ship was facilitated by the electric lighting remained functional.
A secret and large consignment of gold from the Bank of England was in Niagara's strong room and went down with the ship. There were 295 boxes, each containing two ingots of gold (590 ingots total), valued at £2,500,000. The gold was payment from the UK to the USA, which had not yet entered the war, for munitions supplies.
A Melbourne company, United Propriety Salvage Ltd, was promptly contracted to recover the gold. At the time it was one of the deepest salvage operations ever undertaken. The salvage team was led by Captain J. P. Williams and John Edwards Johnstone on the ship Claymore.
The Claymore, built in 1902, 260 tons gross, was an old coastal steamship. When first sighted for the salvage job she was a hulk rusting on the banks of Auckland Harbour. Before recovering any gold the Claymore had to be salvaged herself.
Once Claymore had been restored to working order, the salvage team based themselves out of Whangarei and began operations on 15 December 1940. It took Claymore about two months to find the wreck, which it did by dragging its anchor along the seabed, and minefield. Twice during the search she fouled unexploded mines and was nearly sunk.
On 2 February 1941 the wreck of the Niagara was found and the salvage team started the arduous and hazardous task of retrieving the gold for HM Treasury. They had only rudimentary equipment, a viewing/diving chamber, radio, and a grab lowered from the surface.Williams and his team blasted a hole in Niagara's hull and successfully recovered 555 gold bars: more than eight tonnes and 94% of the total. The remaining boxes were inaccessible to the grab.
In 1953 a further 30 gold ingots were recovered, leaving five bars still unrecovered in the wreck as of 2011.
The diving chamber used in the salvage still exists, on display at the Castlemaine Museum in the town of Castlemaine, Victoria, where it had been made by Thompson's Foundry in late 1940.
- Pacific American Steamship Association; Shipowners Association of the Pacific Coast (1912). "New Triple Screw Steamer For Australian Mail Line". Pacific Marine Review. San Francisco: J.S. Hines. 9 (September 1912): 15. Retrieved 3 April 2015.
- "Cunard Line". The Ships List. Archived from the original on 16 December 2009.
- Gill, G. Hermon (1957). Royal Australian Navy 1939–1942. Australia in the War of 1939–1945. Series 2 – Navy. 1. Canberra: Australian War Memorial. pp. 125–126.
- Ingram 1972, p. 372.
- Ingram 1972, p. 373.
- Dunn, R.J; Johnstone, J. (1942). Niagara Gold: The romantic story of sunken treasure retrieved from record ocean depths, New Zealand. A.H. & A.W. Reed.
- Gordon, Keith (2005). Deep Water Gold: the story of RMS Niagara – the quest for New Zealand's greatest shipwreck treasure. SeaROV Technologies. ISBN 0-473-10056-8.
- Ingram, C.W.N. (1972) . New Zealand Shipwrecks 1795–1970 (4 ed.). Wellington: Reed. pp. 372–373. ISBN 0-589-00715-7.
- Taylor, James (1943). Gold from the Sea. London: George G. Harrap and Co.