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Sonar waves.
They use Sonar to send sound waves to the bottom of the oceans.
Sonar.
sound waves can penetrate the ocean floor.
sonar is used, to steer a vessel because sound waves are emitted around the vessel. Then the sound waves are traveled back to the vessel. If the sound waves are block by an object, it will tell the vessel.
'Sonar". And determines depth. The ocean floor topography can be mapped by 'sonar scanning'.
sonar
Sound waves bounce off the ocean floor and come back up to whatever emitted it. The time it takes for the sound wave to come back tells how far down it went. Doing this many times over and over, one can map out the ocean floor, and if the sound wave comes back relatively fast, that means there is something on the ocean floor.
SONAR, which was developed by the military to detect submarines.
That technique is called sonar.
Sonar (or Sound Navigation and Ranging) is a type of technology that was designed to help with navigation, communication and locate objects underwater. Sonar projects sound waves then listens for the echo of the emitted sound waves to detect objects.
they use SONAR. :)