HMCS Onondaga (S73) is an Oberon-class submarine built in the mid-1960s at Chatham Dockyard in England, representing an advanced iteration of the class with a modified pressure hull and enhanced steel construction, allowing for a maximum diving depth of approximately 1,000 feet (300 meters). The vessel measures about 295 feet 1¼ inches (89.922 meters) in length, with a beam of 26 feet 1½ inches (7.938 meters) and a draught of 18 feet (5.5 meters). Displacing 2,030 tonnes when surfaced and 2,410 tonnes submerged, Onondaga was powered by a twin-shaft diesel-electric system, including two 16-cylinder diesel engines producing 3,680 brake horsepower and two English Electric motors generating 6,000 shaft horsepower. This propulsion enabled speeds of up to 12 knots on the surface and 17 knots underwater, with a range of 9,000 nautical miles at 12 knots, carrying 258 tons of oil. Armed with eight 21-inch torpedo tubes—six in the bow and two in the stern—the submarine initially carried a mix of US Mark 37C torpedoes, later upgraded with new tubes capable of firing the more advanced Mk 48 torpedoes following the 1980s SOUP refit. The vessel was equipped with an array of sonar systems, including Type 187 active-passive sonar, Type 2007 passive sonar, and Type 2019 sonar, which enhanced its underwater detection capabilities. The Canadian modifications included larger air conditioning, active sonar, and different communication systems, tailored for NATO operations and Cold War surveillance. Commissioned on 22 June 1967, Onondaga served mainly with the Maritime Forces Atlantic, conducting patrols in the North Atlantic, including surveillance of Soviet submarines during the Cold War. She participated in training exercises with the Royal Navy and undertook intelligence-gathering missions, notably during the Cold War era. Decommissioned on 28 July 2000, she was the last Canadian Oberon in service. Eventually, she was preserved as a museum ship at the Site historique maritime de la Pointe-au-Père in Rimouski, after a complex relocation process involving multiple attempts to tow her from Halifax. Open to the public since 2009, HMCS Onondaga remains a significant maritime relic, illustrating Cold War submarine design and Canadian naval history.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.