Sound requires a medium, such as air, to travel in. Here is a link to a site dedicated to the case where the medium is water. The site belongs to the University of Rhode Island (USA) and it has plenty of information for educators and students about the science of sound and the animals that make underwater sounds, such as dolphins, whales, and fish. I particularly liked the recordings of the animal sounds.
PS. Thanks to C.S. for the link!
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