Hydrophone or not?

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WolfyWho

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NOTE: Sorry if this is not the correct forum for this. I don't see an underwater video forum though.

Is it worth getting a hydrophone on an underwater video housing? Will the internal microphone on the camera pick up any sound on the outside of the unit, without a hydrophone? I'm guessing it would be really faint if it did. How often do people use the sound track from their underwater footage? I've seen some footage online, and when I do hear the actual underwater sounds it's usually the bubbles from people breathing, and noises from knocking the housing around itself. Are hydrophones sensitive enough to pick up whale or dolphin sounds in the distance?

Thanks,
Scott
 
https://www.shearwater.com/products/peregrine/

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