The first " frog - woman " . " Frogmen " the underwater swimmers used for daring operations during the war - have trained a " frogwoman " to assist them in their demonstrations of this type of war work at Butlin ' s Holiday Camp at Filey , Yorkshire . She is Gwenda Davies of Fulham , 25 year old ex - WAAF and one - time insurance clerk . The team wear suits similar to those worn by the German swimmers who attempted to blow up the bridge at Nijmegen in 1944 . Photo shows ; The frogwoman with the frogmen. Left to right ; John Kassell , ex - Royal Marine , of Richmond , Yorks , JGI Marriott, ex - Royal Marine of Manchester , Gwenda Davies , A Capindale , ex - Royal Marine of Melton Mowbray and " Chuck " Leyland , ex - Sea Recce Unit of Manchester . 28 June 1946