Castle Romeo
1954 CE.
Shown on the map at 11.691°, 165.273°.
Castle Romeo was the code name given to one of the tests in the Operation Castle series of U.S. nuclear tests. It was the first test of the TX-17 thermonuclear weapon, the first deployed thermonuclear bomb. It was detonated on 26 March 1954, at Bikini Atoll of the Marshall Islands, on a barge moored in the middle of the crater from the Castle Bravo test. It was the first of several such barge-based tests at Bikini.
Text from the Wikipedia article Castle Romeo, licensed CC BY-SA 4.0.