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 electronic warfare office between 42 and 43 stations on the port side of 1 deck. The photographer is looking aft from the doorway showing a tape recorder above a desk equipped with a morse key. On the right are two combination safes numbered 17 and 18 with an MCO line circuit box above them. A vertical format negative.