TwinHuey - I cannot see how anyone is going to have a good view of any problem underwater without a mask - if you are caught up inside and they are outside they will, at best, be able to see a blurred mess. If you are talking about a realtively controlled ditching where the aircraft has inverted but not sunk because the floats have inflated then there is possibly a case for trying to extricate others but the situation we train for is where the aircraft has inverted and is sinking - no-one should ever consider going back into that.
Unfortunately, letting people believe they can save others in this scenario is more likely to cost lives. BTW does your dunker training include night ditching?