The United States tested 67 nuclear weapons on the Marshall Islands between 1946 and 1958. ‘Castle Bravo’ in 1954 is the best-known. This 15-megaton TNT hydrogen atomic bomb was a thousand times more powerful than the bomb dropped on Hiroshima. It left a crater in the lagoon of 2 kilometres wide and 76 metres deep ... and ships scattered all over the ocean floor.  You can be one of the few lucky divers to view this haunting ocean realm.  Read more about Bikini Atoll diving >

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