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casing: outer non-watertight upper hull of submarine, designed for hydrodynamic performance. Pressure hull is the inner hull.

CEP (contact evaluation plot): time-bearing plot constantly in operation on patrol where every sonar contact is plotted so its course, range and speed can be calculated for firing solution or to avoid collision.

control room: centre of operations, where captain commands submarine and planesmen manoeuvre, surface, dive, and go to and from PD using ship control console. Houses attack and search periscopes, attack team fire-control and plotting systems. Systems console located here, which controls ballast and trim pumps, hover pump and periscopes. Slop, drain and sewage tank is blown here and hydraulic system monitored.

Coulport (Royal Navy Armament Depot Coulport): on Loch Long, Scotland. Military facility that stores and loads Britain’s nuclear weapons carried by submarines, first Polaris, then Trident.

1 Deck: nav centre, control room, wireless office, sound room, sonar console space, electronic warfare (EW) shack containing radar room, electrical equipment space with closed room containing navigator’s maps.