Z33 and Z34. Aled Jones notes that these are Submarine Scout Zero type airships, operating from the Royal Naval Airship Station at Llangefni, Anglesey, which was active from 1915 to 1918, performing ASW patrols and performing escort duties for convoys traveling through the Irish Sea.

Photographs of dirigibles. T. Woofenden Collection - Photographs from the service of Unit 21 (SC 178, SC 254 and SC 329).