Rat Shack sells a remote control submarine that works with RF and has
removable ballast...

Good to over 3' deep!  Just a few minor modifications and you'll be on
your way!

Mike H.

>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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