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Royal Canadian Navy Porpoise Class diesel-electric submarine
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The Oberon class was a 27-boat class of British-built diesel-electric submarines based on the successful British Porpoise-class submarine.
Thirteen were constructed for the Royal Navy, while another fourteen were built and exported to other countries' navies: six to the Royal Australian Navy, three to the Royal Canadian Navy with an additional two British submarines later transferred, three to the Brazilian Navy, and two to the Chilean Navy.
The Oberon class was arguably the best conventional submarine class of its time, with an astonishing reputation for quietness that allowed it to exist into the 21st century until replaced by newer classes such as the Collins and Victoria classes in Australia and Canada respectively.
The Oberon class was briefly succeeded in RN service by the Upholder-class submarine. The Upholder-class submarines were later upgraded and sold to the Canadian Forces after refit as the Victoria class, again replacing Oberons.
The Australian Oberons were replaced by the six Collins-class submarines.
The two Chilean Oberons were replaced by the Scorpène-class submarines O'Higgins and Carrera.
The Brazilian Oberons were replaced by Type 209 submarines.