Built in Chatham in 1960, one of 27 O-class to be built for the Royal Navy. They were also produced for four other Navies. With the same basic design as the Porpoise class submarine that was superseded by this class, the only difference being updated internal equipment and a stronger hull for increased pressures
Ocelot was launched from Chatham Dockyard in 1962 and commissioned into the fleet in 1964. This was the last submarine built for the Royal Navy at Chatham dockyard, her sister ships being Ojibwa,Onondaga and Okanaga were commissioned into the Royal Canadian Navy.
Ocelot had an operational crew of 68; 6 officers and 62 other ranks, she was armed with 24 torpedoes split between a forward compartment which had 6 tubes and the aft compartment which had 2 tubes.
She weighed 2,030 tonnes with a standard load and when submerged 2,410 tonnes. With a top speed of 17 knots (20mph) submerged and 12 knots (14 mph) on the surface.
Being assigned to the 3rd Submarine Squadron based out of HMNB Clyde she undertook operational deployments and clandestine missions during the Cold War but she did take part in the 1977 Silver Jubilee Fleet Review off Spithead Portsmouth.
The submarine was paid off from active service in 1991 and sold in 1992 where she was turned into a museum ship back in her birth place at Chatham Dockyard.