First of all we know that, what is ultrasonic sound :- The sound having frequency above human audible range are called as ultrasonic sound or supersonic sound.
We human can only heard sound in range from 20 Hz To 20 KHz.
But in case of ultrasonic sound it is above 20 KHz range.
For determine the depth of sea, therefore ultrasonic sound waves are sent from ships toward the seabed.
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