A new method has been developed to find objects that land at sea using underwater sounds.
Using sound waves to disrupt sensor functions is just one of a growing number of "side-channel attacks" that could affect our devices.
Sonic weapons usually leave no physical marks but can be devastating psychologically.
From Long Range Acoustic Devices used to disperse protesters to ear-splitting military drones to songs blasted on rotation to prisoners, ours is an age in which sound has been repositioned as a tool of terror.
The author began hearing the sound at night, between the hours of 10 and 11 p.m.
'Street' via www.shutterstock.com
Shortly after Glen MacPherson started hearing strange humming noises, he created the World Hum and Database Project so people around the world could document their own experiences with the Hum.
We find them at the beach, in every sound and light show, the miracle of wi-fi and now in the fabric of space-time itself. But what exactly is a wave?
Boom ting. The Super Hornet.
Going faster than the speed of sound can create some exciting effects – and it's not just aircraft that do it.
Urban noise pushes birds to sing in high pitch and ship sound deafens whales and dolphins.
John Haslam, Eric Bégin, IK's World Trip, Green Fire Productions, flickker photos, Jay Ebberly / Flickr
Noise pollution, whether on land or under water, can affect animals in interesting – and not always positive – ways.