Britain tests an atomic bomb and technicians prepare at the test site near the Monte Bello Island, Australia.

Britain explodes an atomic bomb during tests near the desolate Monte Bello Island, Australia. Warship at sea. Men reach the target area and make preparations for the test. They set observation posts. Technicians at the test site. Barricades on land. Men watch a timing instrument and wait for the time of the explosion of the bomb. At the decided time, the bomb explodes. A huge fire from the bomb results in the formation of a mushroom cloud.