This thread is pedalling misconceptions. Aeroplanes can be put down on water with remarkably little damage. Escape slides are designed to be easily separable so they may become liferafts or flotation devices. Many aeroplanes have put down on water and remained complete. JAL put one down into Tokyo Bay, and it floated, was recovered and actually flew again. If the sea is relatively calm and the speed kept slow, I would expect any modern passenger aeroplane to remain intact and floating, with very little damage to the occupants. This is borne out by experience.