Does anyone have some ideas for building a homemade cable-tethered RV that can withstand pressure depths of 500 feet in salt water. I was thinking of using small propane cannisters as air ballast tanks. and machining a plastic lens bubble for the camera enclosure. The propeller motors (3 axis), PIC based controls would be in a water tight enclosure. I was thinking of standard PVC Pipe and end caps. I would machine O-ring groves. I suppose I need enclosures for standard flood lamps.
I will use PIC based controls to limit the number of conductors from the boat to the RV.

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