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Credit: Trinity and Beyond: The Atomic Bomb Movie (1995) by Peter Kuran

Castle Bravo was the code name given to the first U.S. test of a so-called dry fuel thermonuclear (fusion- rather than fission-based) device, detonated on March 1, 1954 at Bikini Atoll, Marshall Islands, by the United States, as the first test of Operation Castle (a longer series of tests of various devices). Unexpected fallout from the detonation—intended to be a secret test—poisoned the crew of Daigo Fukuryū Maru ("Lucky Dragon No. 5"), a Japanese fishing boat, and created international concern about atmospheric thermonuclear testing.he bomb used lithium deuteride fuel for the fusion stage, unlike the cryogenic liquid deuterium used as fuel for the fusion stage of the U.S. first-generation Ivy Mike device, which, being the size of a small office building, was an impracticable weapon for use at war. The bomb tested at Castle Bravo was the first practical deliverable fusion bomb in the U.S. arsenal.

The Soviet Union had previously used lithium deuteride in a nuclear bomb, their Sloika (also known as Alarm Clock) design, but since it relied on using the initial fission explosion to compress, inertially confine, and ignite the fusion fuel, its yield was limited (400 kt) in comparison to the Teller-Ulam-based Ivy Mike (10.4 Mt) and Castle Bravo (~15 Mt). Mike and Bravo both used the Teller-Ulam design, which featured separation of the fusion device from the fission device, and used radiation pressure (or probably radiation-induced ablation of the heavy tamper surrounding the fusion device) to produce staged-radiation implosion and fusion ignition of a much greater magnitude. After a few years, the Soviets, led by Andrei Sakharov, independently developed (Sakharov's Third Idea) and tested (RDS-37) their first Teller-Ulam device in 1956.

Castle Bravo was the most powerful nuclear device ever detonated by the United States, with a yield of 15 megatons. That yield, far exceeding the expected yield of 4 to 8 megatons, combined with other factors to produce the worst radiological accident ever caused by the United States.

Though some 1,000 times more powerful than the atomic bombs which were dropped on Hiroshima and Nagasaki during World War II, it was considerably smaller than the largest nuclear test conducted by the Soviet Union several years later, the ~50 Mt Tsar Bomba.

This clip was taken from the documentary "Trinity And Beyond"

Directed By: Peter Kuran
Music By: William T. Stromberg
Narrated By: William Shatner