Those 7 degree rolls are a bitch...I have seen this happen on carriers before, if it was that bad for us I hate to think what it would have been like for a sub on the surface
Two stories told to me by my dad who served on Diesel Fleet boats (SS-42x):
-While operating in some rough water on the surface/snorkeling, one young khaki-wearing go-getter was just not operating at a useful level. He was puking to the point where the doc put him under. After some time, the boat dived down to depth and things smoothed out. By this time, our hero awoke and worked his way back to his watch station. Someone (I'm convinced this was a Chief, but not certain) took him up to the control panel that showed the boat's status. An order was given to adjust depth, so the dive bubble moved from level to a disoriented-induced position (it moved a little bit to show dive angle). The aforementioned khaki immediately came down with a violent reaction to his perceived surroundings.
-Diesel boats, by definition, need to run their diesels. Part of doing that is snorkeling. A somewhat common occurrence was operating at snorkeling depth in rough seas. As the boat would work through the seas, the OOD or Dive Officer (sorry, I'm don't remember which) was responsible for not running the boat too deep so that the snorkel went under water. Again, as the boat would run through the seas, this would become a challenge to the point where the sub may run "too" deep, triggering the exhaust valve for the diesels to shut as the water ran over the exhaust. This would IMMEDIATELY cause a pressure change w/in the hull, causing a reaction by the bridge team to counter the issue. Sometimes the reaction was too "energetic," and the sub would over-compensate, causing it to rise up to an "airborne" state, only to come crashing back down again, called broaching the boat. When the offending watch officer was "convicted" of such an act, he got to wear a LARGE set of wings on his patrol uniform. These were not sought after.
I don't wish to be on such a vessel, but some of the stories my dad told me certainly made me appreciate the Old School Navy, be it sub, surface, or air.