About fifteen years ago there was a device like that. It had a two-stroke motor and a snorkel as well as a radio remote control. It failed to take off though, it kept sucking water through the snorkel when it capsized. It was made by a company that made diver’s submarines. I had a fun Saturday afternoon with it, but wasn’t impressed enough to buy it. I still have one of their submarines – also snorkel breathing – it pulls a diver along a metre below the surface. When you let go of the controls to dive it circles until you come back for it.