Britain Explodes Its A-bomb. Britain explodes its first atomic bomb in tests near the desolate Monte Bello Islands - the third world power to possess atom weapons. A triumph for British science, the a-bomb produces an unusual cloud - possible indication of a new type bomb. Nuclear arms race. VS empty warships. On shore, men are at work with construction equipment, prepare for the tests. Dark interior (bunker), technicians prepare/operate instruments. Clock ticks down toward zero hour. Shot of explosion already in progress. Men watch from afar. Huge cloud of smoke over the water.