> The main reason you don't hear of sea rescues after aircraft crashes are because, AFAWK, none were survivable
There is nothing intrinsically fatal about a ditching on the high seas. The aircraft does not know or care how far it is from land.
If you do not hear much about sea rescues it is probably because accidents are very rare in the first place.
> When an aircraft loses control at high altitude, it either regains control before long and then diverts or just continues on down at such speed you might as well be crashing into a wall at that point in terms of physical ability to survive.
That is utter nonsense.