I'm sure it's way worse than the video shows. I remember spending a November aboard a merchant marine ship in the Caribbean (not the Southern Ocean) and going through a relatively shallow low pressure system on the return. We had HUGE waves and foam streaks across the surface. I tried on several attempts to take a picture of the bigger waves and the photos were pitiful. It didn't look any worse than a fresh day in Panama City Beach. I ended up just deleting the photos.