MLSs, MSs, of man inside large barrel of gun, cleaning barrel, coming out breach end, of man painting top of barrel. MS of sandbagged camera bunker on cliff. Shot of rapidly turning radar scanner. Shots of mobile radar station, of radar scanners. Interior shots of operator at set, radar crew, radar scope in darkness, buttons, meters. Front, rear and side shots of large gun elevated at about 45 degree angle, of crew working on gun. Sequence showing General Clark, Director of US Army Research getting off plane at Seawell Airport in Barbados at night, being greeted by Dean Mordell of McGill University and other HARP personnel, walking off with Dean Mordell. Shots of Clark and party, Mordell, walking about, chatting. MS of McGill University and US Army Research Office crests side by side. Two shots of crew at breach end of gun during loading of Martlet (no shot of actual loading), LAMS of muzzle of gun. Longer shots of gun elevating. LAMLS of muzzle at near maximum elevation. TILT DOWN Martlet standing on end, technicians. LS of Martlet standing on end, PAN to gun breach, technicians during loading operations. Shots of loading of powder, of Martlet just before loading. TILT UPs and TILT DOWNs barrel at maximum elevation. Interior shots of bunker, operator at control, hand pressing button. LS of gun (no shot of firing). Shots of HARP scientists including chief scientist Dr Gerald Bull, US Army Research Dr Lemons, Project Director Dean Mordell. Shot of them looking at model of Martlet.