>I noticed that for cheap say 10$ rc cars the rx only go 5in down then quit got any experience in expanding rado depthage?


Really? You've had more luck than I've had with r/c car boards while they're submerged.



>Got any pics of your projects or progress?

Try the "Convert This" topic. I didn't start it, but posted several Seawolf SSN-21 pictures. It's a Trumpeter Seawolf 1/144 shell into which I've put PVC encasing my batteries, boards, and drive motor--with external connections for its wet servos, antennas, and on/off.