 A secondary purpose was to detect and destroy mines.The SSZ was built at the Royal Naval Air Service (RNAS) airship station at Capel-le-Ferne near Folkestone to the design of three officers that were serving there as a successor to the SS class.Similar to other SS class types, the SSZs had an envelope of capacity containing two ballonets of each; and like the SSPs, the fuel was contained in aluminium tanks slung on the axis of the envelope.