Castle Romeo was the first barge-based U.S. nuclear test and the first detonation of the TX-17, the first deployed thermonuclear bomb.
Key Facts
- Detonation Date
- 26 March 1954
- Test Series
- Operation Castle
- Weapon Tested
- TX-17 thermonuclear bomb
- Test Location
- Bikini Atoll, Marshall Islands
- Platform Type
- Barge (first barge-based test)
- Crater Source
- Castle Bravo crater
Location
Cause → Event → Consequence
Increasingly powerful thermonuclear devices being developed by the United States during the early 1950s destroyed the small coral islands used as test platforms, making land-based detonation sites impractical. A new barge-based approach was devised to accommodate the destructive yield of these weapons within the Bikini Atoll test range.
On 26 March 1954, the United States detonated the TX-17 thermonuclear bomb — the first deployed thermonuclear weapon — aboard a barge moored in the crater left by the Castle Bravo test at Bikini Atoll. This was the first nuclear test ever conducted from a barge platform, forming part of the broader Operation Castle test series.
Castle Romeo demonstrated the viability of barge-based nuclear testing as an alternative to island-based detonations, enabling further high-yield thermonuclear tests in the Pacific. It also validated the TX-17 design, advancing the United States' deployed thermonuclear arsenal during the Cold War arms race.