Joined a cavern tour today to try out my CamOne below water, using the original DiveBox with domed lens, meaning I had to manually re-adjust the camera's focus by rotating its optical element, about 90° counter-clockwise, so as to get relatively sharp underwater footage.
Note that with this solution you can't have it both ways, it's either sharp above or below. Evaluating the Full HD clips I'd say I haven't quite hit the optimum setting yet, but it's hard to tell due to grain.
