The Oberon-class submarines are a class of diesel-electric submarines originally built for the Royal Navy of the United Kingdom. They were designed in the 1950s and entered service in the early 1960s. Known for their versatility, these submarines have been used for various roles, including anti-submarine warfare and intelligence gathering. Several countries have operated or modified the Oberon-class, including Canada, Australia, and Brazil. The submarines are characterized by their relatively small size and quiet operation, making them effective in coastal and shallow waters. Many have been decommissioned, but some remain in service or have been upgraded for modern use.