In 1954, a U.S. Air Force B-57B Canberra aircraft filmed Castle Bravo, the most powerful nuclear test ever carried out by the United States. The detonation took place at Bikini Atoll in the Marshall Islands and produced a fifteen megaton explosion that was about one thousand times stronger than the bomb dropped on Hiroshima. The fireball grew several miles wide, and the mushroom cloud rose more than forty miles into the sky. The unexpected strength of the blast spread dangerous radioactive fallo

In 1954, the US tested a hydrogen bomb called "Castle Bravo" at Bikini Atoll. Scientists miscalculated the yield; they thought it would be 5 megatons. It was 15 megatons—1,000 times stronger than Hiroshima. The fireball was 4.5 miles wide. It rained radioactive white ash (which looked like snow) on a nearby Japanese fishing boat, the Lucky Dragon No. 5. | Gordon Hutchinson

On March 1, 1954, a B-57B Canberra jet filmed Castle Bravo, the largest U.S. nuclear test, at Bikini Atoll, capturing its 15-megaton blast—bigger than the expected 6 megatons—as part of Operation Castle. The plane recorded the huge fireball and cloud, but the explosion’s fallout spread far, harming people nearby and a Japanese fishing crew, making the footage a key Cold War record. | Historyinmemes

Castle Bravo, 1954—15 megatons of raw explosive force. The largest U.S. nuclear test ever conducted. What’s wild? That’s the same magnitude as the Tunguska event—a cosmic blast that flattened Siberia in 1908. Nuclear tests gave us more than fallout. They gave us insight into the terrifying power of celestial impacts. | The Randall Carlson