HMS Onyx was a British submarine of the Oberon class, launched in 1960. It was designed for anti-submarine warfare and reconnaissance missions during the Cold War. The submarine was equipped with advanced sonar and torpedo systems, allowing it to operate effectively in various maritime environments. Throughout its service, HMS Onyx participated in numerous exercises and operations, showcasing the capabilities of the Royal Navy. The submarine was decommissioned in 1992, marking the end of its active duty. Today, it serves as a historical example of mid-20th century naval engineering and strategy.