ORIGINAL: Taxidriver
Anything is possible, the fact that your asking suggests that you have never built/operated a submarine nor flown a RC helicopter. This being the case, I suspect that this project may be too much for you. Save your money.
Now thats the kind of encouragement we need , Good job bro !! Anything is possible with a little experimenting.
Dont let the in-ability of others discourage you bro.