On board the Type 12 frigate HMS Londonderry (1958) alongside the fitting out berth at the West Cowes shipyard of John Samuel White & Co Ltd. The photographer is in the asdic control room on the starboard side of 1 deck between 35½ and 39 stations looking forward. On the extreme right is the chair of range operator of the Type 177 asdic console. The four positions against the forward bulkhead are the type 170B asdic bearing, centre, range and depth consoles. On the left on a raised platform is the chair of the senior officer.