Britain Tested Its First Atomic Bomb
On this day · 3 October 1952
A bomb hidden inside a warship's hull turned the United Kingdom into the world's third nuclear power off a remote Australian coast.
On 3 October 1952, Britain detonated its first atomic device in Operation Hurricane, fired in the Montebello Islands off the coast of Western Australia. The blast made the United Kingdom the world’s third nuclear power, after the United States and the Soviet Union.
The weapon was a plutonium implosion device, broadly similar to the bomb dropped on Nagasaki. Rather than mount it on a tower, engineers placed it inside the hull of the anchored frigate HMS Plym to simulate a nuclear weapon smuggled into a harbour aboard a ship. The detonation released energy equivalent to roughly 25 kilotons of TNT, vaporising the ship and gouging a wide crater into the seabed.
The first British bomb was hidden not on a tower, but inside the belly of a warship.
The test capped a rapid postwar weapons programme driven by Cold War politics and Britain’s exclusion from American nuclear secrets. It also left a lasting legacy of contamination and disputed health effects for service personnel and local communities exposed to fallout.
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