We live on a lake where there are several local boat manufacturers testing boats and doing web and catalog photography each year. They use big 6 rotor drones with camera gear to do video clips of the boats underway for their sites. Very cool to watch them with someone really good at the controls. If they mess up, that's a TON of money into the water and they aren't at all water friendly. He said it would definitely sink like a stone and our lake is ~100' deep in spots.