Now, problem is im not that good in C.
But I take it that you do have mechanical engineering experience? Because if you don't, you are about to get a good education.
One of the most difficult things to do in building an ROV is keeping the electronics (and depending on the design, the motors) dry at depth. This is mainly because of the electrical connections (at least, until you start going beyond about 20 feet or so in depth) leading in and out of the various pressure vessels. They make connectors for such usage, but they tend to be very pricey (and overkill for most hobbyist ROV designs). So, you have to design your own.
Good luck with your design, but the coding end is only the beginning of your education, so to speak!
