What is the relationship between the 1963 Partial Test Ban Treaty and the 1996 Comprehensive Nuclear-Test-Ban Treaty (CTBT)?

The 1963 Partial Test Ban Treaty (PTBT) prohibits nuclear explosions in the atmosphere, outer space and underwater, but does not prohibit underground nuclear explosions. By comparison, the 1996 CTBT prohibits all nuclear explosions on Earth, including in the underground.

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