The large problem with underwater technology is that we don't have a great way to power it. Batteries run out...wires get tangled...and that's about it. You can't keep anything underwater for too long by itself unless you figure out a good power system. Well one scientist thinks underwater solar energy is the answer...take a look.
http://www.science20.com/ysabel_yates/generating_solar_powerunderwater-91089
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