3-062-984 - Historic England Archive/Heritage Images

Still from the film 'Operational Height' produced by the RAF Film Production Unit during the Second World War, showing two men in uniform aboard a ship at night, 1942. 'Operational Height' was a film produced by the Royal Air Force Film Production Unit during the Second World War. It "gave a dramatised account of the work of RAF barrage balloons flown at sea in the Thames Estuary." The film has been digitised, and can be viewed on the Imperial War Museum Collections website.