Buy an Axon, Axon II, or Axon Mote and build a great robot, while helping to support SoR.
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sod ethernet, use an ethernet cable to run two usb lines, one for a web cam and another for the micro. cheep web cam from ebay will do fine. can probably use the power lines on the webcams usb to run the LED lights aswell, reducing draw on the battery.run all your 5 volt systems over USB, and use the battery for the motors. ethernet cables have four twisted pairs, USB cables have four twisted wires. therefore use a ethernet cable to bring in two usb lines. permanatly attach the wire into the bot.
Q1: How long of a cable can I use to connect my device?A1: In practice, the USB specification limits the length of a cable between full speed devices to 5 meters (a little under 16 feet 5 inches). For a low speed device the limit is 3 meters (9 feet 10 inches).
We'll look into the sealant issue, as we have no final plans as to how we're going to keep the water from entering the electronics area through where the cables go.
You have a UUV? .... link?
Yes, pretty much, and a switch if you want to run two streams to the top on one line.
I'd be cautious omitting a water sensor from the beginning, as it is a safety measure. I'd hate for you to lose all your electronics on your first dive!
GPS is only useful if your robot comes to the surface to get a new fix, as dead reckoning underwater builds up in error over time.