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 sonar instrument compartment between 16 and 27½ stations on 3 deck. The photographer is looking into the forward starboard corner showing two cabinets labelled Sonar Type 177 spares cabinets SC No.1 and SC No.2. A cupboard and drawer unit is next to them with a high level cupboard above it. A vertical format negative.