A hydrophone is an underwater microphone designed to listen to below-water sounds. It can record and listen to sounds in other mediums (air, underground), but it won't be as accurate and sensitive, since it has been based of a sound impedance match exclusively to water.
Hydrophones are also capable as acting like a speaker and producing sounds. This is how submarines go "active" and ping the water. Some submarines sonar is so powerful that it can boil the water around the hydrophones after a couple of full power pulses. It is also the primary means of defeating unauthorized divers around a sub when it is surfaced and/or in port. The sound will disorient and confuse the diver like a flash-bank grenade would in a room.
Hydrophone
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It just does what it do's
The hydrophone :)
hydrophone
A hydrophone is a microphone used to capture and record underwater sound. It is commonly used in marine research, underwater acoustics, and for detecting sounds in underwater environments such as in submarines, seismic exploration, and marine mammal studies.
Whales and other sea creatures
One is the hydrophone, used to pick up sound waves underwater.
Sonar SOund Navigation And Ranging
Hydrophones are used to detect and listen to underwater sounds, such as marine life, ships, and other underwater activities. They are also used in scientific research to study oceanography, marine biology, and environmental monitoring. In addition, hydrophones are utilized in various industries including underwater communications, navigation, and defense applications.
Marine biologists use hydrophones to record underwater sounds.
A Hydrophone. This is a waterproof microphone essentially. For simple work at modest depths, you could use an ordinary microphone, making very sure that it and its leads were well waterproofed.