A roll film negative. On board the Tribal class type 81 frigate Mohawk (1962) in Portsmouth Dockyard. She was in a dry dock from 21 March to 11 April 1972 when she moved to the South Railway Jetty. In the communications control room (transmitting) between 43 and 45 stations on the port side of 3 deck. The photographer is looking forward from aft on the port side of the compartment showing banks of transmitters. A vertical format negative.