Analyze the sounds that occur in the ocean is not a simple task. This activity has even been compared to space exploration; the difference is that in space there are several companies and agencies investigating, while the ocean is still pending and subject to some unknown point. Listening underwater work currently focuses on three disciplines: marine biology, geology and geophysics, and military activity.
For this type of underwater research succeed calls are used hydrophones, also known as underwater microphones, which are devices designed to capture and locate sources of sound in water, where its complexity and its wide range of possibilities make their use key for various tasks. Today we will know a little more about them and some of its major holdings.