Modern podded engines are 'designed' on impact to shear off from the wing and fly over the wing upwards and rearwards with an impact with the ground - how this would occur with 20ft waves and large troughs between waves would be anyones guess but probably as mentioned - in one big mess.
A charter ferry pilot from Aus - Ray Clamback has ditched in a PA28 recently and lived to tell the tale - after some time in warm waters, however I dont think that it is an experience he would like to repeat.
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Its life Jim, but not as we know it!!