MLS of Suffield experimental station central laboratory. MS of plaque to that effect. Four interior shots of shirtless technician manning complex electronic control panels. Several exterior shots of other men setting up various test apparatus in blast area, of expendable trucks. MS of dummy in one of the trucks. Exterior and interior shots of shelter containing 200 000 pounds of TNT. Several shots of observers from United Kingdom and United States gathered to witness blast, military men, scientists. Shot of countdown, man throwing switch. Shot of explosion in the distance a fraction of a second after detonation. Two shots of giant nuclear-type plume of smoke and debris. Shots of technicians inside bunker taking readings, of prairie and herd of pronghorns fleeing.