The 10th Submarine Squadron was an administrative unit of the Royal Navy.
The squadron was formed at HMNB Clyde, Faslane in the 1960s to direct the Resolution-class submarines equipped with Polaris missiles that formed part of the United Kingdom's strategic nuclear deterrent. The squadron would later direct the Vanguard-class submarines equipped with Trident missiles.
References
10th Submarine Squadron (United Kingdom) Wikipedia(Text) CC BY-SA