Hi , i'm building a rov (underwater vehicle) and i thought it would be a good idea to use wireless communication. But i suddenly noticed that underwater wireless communication is quite difficult, so i was wondering what's the best communication wired protocol to use. I need minimum 10 meters of lenght between the controller and the vehicle.
Hello bystrix
Welcome to the worldbest Arduino forum ever.
Take some time and take a look to the IP Protocol stack to find a proper solution.
Have a nice day and enjoy coding in C++.
Keep it stupid simple (KISS) and use serial (RS232 / RS422 / RS485).
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Understatement of the century! 
What data rate are you looking at?
Maximum length?
As @sterretje said, RS232 / RS422 / RS485 would be a good place to start
@bystrix
Full duplex (4 wire) RS485
For a vehicle that is supposed to "ROV" you need to find wire that has neutral buoyancy so it does not inhibit the roving by floating and pulling the vehicle up or sinking an pulling the vehicle down. Another underwater difficulty.
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