FOLLOW SHOT of truck to MS of sign re Defense Research Board, Suffield , Alberta. MS of guard at gate letting vehicles (cars, tank truck) in. Interior MS of guard raising entrance gate from inside guard house. Sequence showing DC-3 taxiing to a stop, officers coming off, being greeted by other officers. Sequence on technicians getting ready for explosion, showing dummy personnel being set up, various test devices on field, photographers and observers moving about, snaping pictures of proceedings. Shots include views of scientists and officers explaining expected effects of blast (no sound). Shots of tumbleweed rolling across prairie. LSs of small herd of prong horns racing across prairie field. Shots of observers getting ready for blast. Shots of huge cloud seconds after blast (no shot of actual explosion), of atomic-type mushroom cloud.