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Submarine detection methods have been steadily improving for a long time now, their usefulness is declining but they will still be viable for quite some time.

A good discussion from 2 years ago: https://news.ycombinator.com/item?id=9073740

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As said in the conversation you linked (which is interesting, thank you), the obsolescence is for the attack submarines close to their target, whereas missile submarines, like the Columbia, has still the rest of the ocean to hide.

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