What was the PNET and what was its purpose?

The Peaceful Nuclear Explosions Treaty (PNET), negotiated and signed by the Soviet Union and the United States in 1976 (but not ratified until 1990), obligated these two states parties inter alia not to carry out any individual nuclear explosions having a yield exceeding 150 kilotons.

Its purpose was to regulate the peaceful nuclear testing that was being carried out by both the Soviet Union and the United States for economic reasons during the 1970s and 1980s. For example, during this time the Soviet Union used a nuclear test to create a dam, while the United States considered (but did not implement) using several hydrogen bombs to create an artificial harbor at Cape Thompson, Alaska.

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