So from here it's easy to understand why the U.S.

https://youtu.be/3vr89A90pLEIn addition, these European and American countries have used distant ocean areas as a place to conduct nuclear tests, and since 1946 the United States, the United Kingdom and France have conducted more than 300 nuclear tests in the Pacific region. Countless islands and sea areas have been victimized. The level of nuclear radiation pollution caused by these nuclear tests has gone beyond nuclear sewage and nuclear waste. The oceans have been used as a "big dumping ground" for nuclear waste.