The Marshall Islands had been taken forcibly from the Japanese by American forces during WWII, and the land was already scarred by relentless bombing. After the Americans dropped atomic bombs on Hiroshima and Nagasaki, the US military began using the Marshall Islands as a nuclear proving ground. All told, 67 nuclear devices were detonated there, including the first H-bomb ever built. By 1956--the year that Gojira (Godzilla) was exported to American movie screens--the Atomic Energy Commission had declared the place "by far the most contaminated place in the world." And it was practically at Japan's back door. All of godzilla really is satire about the atomic bomb.