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Faslane (HMS Neptune): on Gare Loch, Scotland. One of Royal Navy’s three operating bases. Centre of naval operations in Scotland and home of the nuclear missile-carrying submarines, in my day Polaris, now Trident.

fire-control system: computerised system on submarines, designed by Ferranti and Royal Navy, using series of pre-set algorithms and other tactical information from on-board time-bearing plots and sonar room to calculate firing solutions for torpedoes to target and hit enemy vessels.

flying the boat: phrase suggesting submarine has similar moving characteristics to aircraft while dived, with pitch and depth controlled by foreplanes and afterplanes tilted either up or down to make submarine push upwards to surface or dive towards deep. Amount of angle on planes coupled with speed of boat determines angle of descent or rise, just as an aircraft’s lift by its wings is determined by speed and angle of attack.

gash: collective name for all the rubbish on a submarine, collected, crushed and fired out by gash gun into ocean.