ROYAL NAVAL AIR SERVICE RNAS 1914-1918 (Q 27488) Three members of crew at work on the starboard engine gantry of a Royal Navy Air Service North Sea (N.S.) type non-rigid airship during an anti-submarine patrol off the British coast circa 1918. None appear to be wearing a safety line. On the upper level the mechanic is standing next to his compartment from which he controlled the 240HP Fiat engines. On the lower level a gunner mans his gun.