I have converted a UMax to be used under water,,,as a wader.. I doubt that the coil will be deeper than three feet, but there will be plenty of hours on it..Coil the 8 inch concentric...Other than possibly using a dab of silicone rubber at the coil/ coil wire connection point, is there anything else I might consider? An hour or two, compared to seven or eight hours can, almost be considered an order of magnitude..Is the land coil wire covering, the same as the U/W machines?If the U/W wire covering material is different, then I may have to improvise/// Thanks for any comments