Oberon-class submarine

The Oberon class was a family of 27 diesel-electric patrol submarines of British design, built between 1957 and 1978 and operated by five navies: the Royal Navy, the Royal Australian Navy, the Brazilian Navy, the Canadian forces and the Chilean Navy. The design followed the Porpoise class with the same dimensions but a stronger hull of QT28 steel and updated sonar and radar, and the boats earned a reputation for remarkable quietness during Cold War surveillance, special forces and training duties. Four British yards built them, and Chatham Dockyard completed six, including the three submarines for Canada and HM Submarine Ocelot, the last warship built at Chatham for the Royal Navy. The last of the class left service in 2000, and Ocelot is preserved at Chatham Historic Dockyard.