The detection of the iceberg in the way of the submarine is done by the [[1]] technique.

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Detailed Solution

The detection of icebergs in the way of a submarine is done by the SONAR technique.
Sonar is a technique used to detect underwater obstruction in the path of submarines. SONAR stands for sound navigation and ranging. Sonar emits ultrasonic sound waves and detects the echo from the reflecting surface of the objects and thus finds the distribution of frequency and the range of the objects.

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