DIY ROV!

[dogteam]

DIY underwater rover makes public debut - GadgetBox on NBCNews.com

For those that don't want to get wet

Good to 100 meters. Reasonably cheap.

 

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[ScubaFinder]

I helped Eric design a Lithium Polymer battery system for OpenROV. Neat little ROV with a good bit of power and versatility. If you look on the forum, there is a great discussion on ROV power sources that many could learn from. I designed the LiPo version and the community took that and ran with it.