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goffa: non-alcoholic soft drink.

HMS Dolphin (Gosport): former shore-side centre for submarine training. Royal Navy Submarine School was relocated to HMS Raleigh (Torpoint) in 1998.

LOP (local operations plot): time-bearing plot using information from sound room or periscope to calculate target motion analysis on ship or submarine contacts.

PD (periscope depth): depth equal to length of periscope when dived.

Perisher: Submarine Command Course, so-called because candidates pass or perish. Run twice a year for c. 24 weeks, taking in simulation exercises shore-side and sea-going exercises on nuclear submarine. Success leads to second-in-command, then captaining nuclear submarine. Failure, a bottle of whisky and never again setting foot on submarine.

pipe: boatswain’s call used by quartermaster to pipe aboard captain on change of crews and pipe exiting captain off boat. Also used for flag officers – rear admiral and above – if visiting boat.

Polaris: Britain’s first submarine-based nuclear ballistic missile system, in service from 1968 to 1996, when the last Resolution-class submarine in service, HMS Repulse, was decommissioned.