How can a sunken city, Atlantis disappear from the sonar?

It is still a myth as far as our modern civilization is concerned, Atlantis located somewhere within the devil's triangle and it's inhabitants had struck down many planes and vessels daring to disturb the peace. Without resorting to magic how can Atlantis disappear from the sonar? (Answer with most primitive tech wins.)

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How can a sunken city, Atlantis disappear from the sonar?

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