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... o prevent foreign nuclear submarines from invading.


It was a method that used anti-submarine aircraft and anti-submarine destroyers to drop sonar equipment in the sea area to form a quadrangle square sonar.


The range was huge and could reach up to 300 nautical miles.


As long as a foreign submarine entered the square-shaped range, it could be detected. Even the most advanced submarine stealth technology would lose its effectiveness in the square-shaped range.


...

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