The limits was that testing could only occur underground for nuclear weapons testing.
The limits agreed to by the United States, the Soviet Union, and the United Kingdom regarding nuclear weapons testing in 1963 were that testing could only take place underground and that it could not take place underwater, in the atmosphere, or in outer space.
This was due to the fact that the explosions could be contained and no radiation was released into the atmosphere due to nuclear weapons. It was forbidden to do it outside, in water, or in outer space. They were only allowed to test underground to ensure that the tests were safe for the rest of the world. Examining earthquakes now can reveal whether tests are being conducted without the public's knowledge.
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