Hydrophone

[Freezerburn]

Just thought it might be interesting to hear whatever sounds the fish/crabs etc make. I know we don't have whales and dolphins, but I'm sure some interesting noises could be heard or a possible way to monitor pump health. There is a video in the comments showing a really simple one.

 

http://www.instructables.com/id/Underwater...one-Hydrophone/

Edited June 7, 2008 by Freezerburn