Wow - thats a lot of water! I am always afraid to soak them like that for fear of rot - but maybe I'll try it for 24 hours and see if it will shock them into doing something. I usually completely bury my tubers in the potting mix, but maybe if just the "hind end" is saturated like that..........
I tried cutting most of the sprout off of one, to see if it would respond to that, but so far - nada.
