Although cells lose much of their power yield when submerged, they may not be useless. Researchers in India say submerged cells could be used in monitoring sensors and for other commercial and defense applications. An amorphous silicon cell from Panasonic was tested in their study.
They only use them to heat pools at the moment – someone should put 2 and 2 together.
No reason why this idea won’t work – self heating pools are go!