4th Submarine Squadron (United Kingdom)

The 4th Submarine Squadron was a unit of the Royal Navy's submarine service. It was based primarily at Faslane Naval Base (HMS Neptune) on the Clyde in Scotland. The squadron's primary role was to support the Royal Navy's nuclear-powered submarines, particularly those armed with ballistic missiles (SSBNs). This support included providing logistical support, training, and operational planning assistance.

The squadron was responsible for ensuring the readiness of the submarines for patrol. This encompassed a wide range of activities, from maintaining equipment to coordinating exercises. It played a crucial role in the Continuous At Sea Deterrent (CASD), the UK's nuclear deterrent posture.

The composition of the 4th Submarine Squadron varied over time but typically included a number of nuclear-powered submarines, support staff, and associated facilities. Over the years, it operated various classes of submarines, including the Resolution class and the Vanguard class.

The squadron has undergone reorganizations within the Royal Navy’s command structure throughout its existence. Its responsibilities have sometimes been integrated with other submarine commands and support elements as part of broader efforts to streamline operations and improve efficiency. Information regarding the current status of the 4th Submarine Squadron and its functions would need to be verified with updated Royal Navy documentation.