Underwater acoustics is the scientific study of natural and man-made sounds underwater.

Behind them, the fires of the Second Legion faded into nothingness and before long theirs were the only man-made sounds to break the night.

The only man-made sound around here was the water dripping from my clothes and chest harnesses on to the leaf litter.

No streetlights or man-made sounds puncture the setting.

The sound pressure level of large rocket engines has been measured at greater than 200 decibels - one of the loudest man-made sounds on earth.

A sense of peace pervades this moorland, unbroken by man-made sound or any visual disruption.

These devices were meant to simulate natural and man-made sounds, such as trains and bombs.

The slap of their feet on the deck was about the loudest man-made sound.

He opened his eyes, glanced at the sonar indicator, which was pointing in the direction of the largest regular, man-made sound.

Vocal mimicry can include conspecifics, other species or even man-made sounds.