Waves are on the surface, a dived sub is 'below' the waves.
Why would a sub 'under' the waves be affected by them?
After doing a little googling, I found an FAQ page (apparently from the Royal Navy, relating to nuclear subs), but it seems to fit the subject at hand.
http://www.royalnavy.mod.uk/operatio...tFormat/print/
(near the bottom)
Quote:
Q. Can you feel the waves on a submarine?
It depends on the size of the waves on the surface. During normal weather conditions, a submerged submarine will not rock with the motion of the sea. In fact, during moderate storms the submarine remains level at its submerged depth while the waves crash above. In extremely violent storms, like hurricanes or cyclones, wave motion can reach to a depth of 400 feet; though not as violent as the surface, these waves can cause a submarine to roll 5 to 10 degrees either way.
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Overall, it seems SH4 is more accurate in how surface conditions affect a submerged submarine.
I think even SH1 reflected this sort of effect, of being able to dive a little ways (or a bit deeper in very heavy seas) so surface conditions did not affect a sub's speed. I recall some times finding it better to just dive and go submerged at minimal speed rather than wasting fuel on the surface with barely reaching 1/3 or 1/2 of the usual speed.