I like to fan the bottom looking for artifacts, bottles and fossils buried a few inches below the surface. I have had good luck doing this in areas that other divers consider "picked clean". Fanning by hand is tedious and tiring. I am aware that some divers use DPV's for fanning, but that seems a bit awkward. I'm thinking a good quality 18v drill/driver with a small propellor (such as a prop from a small electric trolling motor) would be perfect. Unfortunately, I have been unable to find any reference to a waterproof cordless drill. Any thoughts for waterproofing a regular drill such as a DeWalt? Bag it? Build a housing? Can it be potted? How about sealing the shaft? Perhaps a trolling motor seal could be incorporated into a solid housing. In my case it would only used to about 30 ft., so pressure would not be as significant as something built for depth. Any other thoughts for accomplishing the same thing? I have seen small ROV's built from bilge pumps, they would produce some wash, but perhaps not enough. It would have to be self contained, not surface supplied, and as small as possible. Any thoughts, comments or suggestions appreciated.
