On board the Type 81 general purpose frigate Eskimo (1961) in No. 3 basin in Chatham Dockyard during her 1971-1974 modernisation. The photographer is in the sonar instrument compartment between16 and 28 stations on 3 deck looking to starboard and aft from 18 station on the port side showing a hoisting winch and the cover over the watertight hatch in the centre of the compartment. A telephone, an asdic type 162 junction box, an asdic type 162 receiver/amplifier and sonar cabinet No. 5 are against the ship's side. A vertical format negative.