Well let me put it to you like this lol... The boat was 110' long, we had a quite a few days of 50ft seas and one day of 70ft and seas were we all had our survival suits on thinking the ship was going down. We also do a thing called jogging which we each take one hour on the helm so we can each get a few hours of sleep. You jog in a strait like via GPS back and forth for an hour then wake the next guy up to take your place. I was jogging one night and it was really ruff out and when I went to turn the boat around and a wave hit the port side and almost rolled the boat over, we had so much lisp the captian flew out of his bed.
Ice was also a problem, we would spend hours and hours with sledge hammers pounding ice off the boat. To much ice and the boat gets top heavy and can flip over.
Pick and boom and crane in foul weather is also a killer. After you pull a set of strings (pots) you have to stack them on deck, try doing this in 50ft seas with some n00b on the crane. It's fuckin so dangerous, the pots weigh 1100lbs. Launching pots is also dangerous... 300 fathoms of rope and if your leg gets tangled your going with it nothing you can do. I could go on and on about how dangerous, you think of it, it happened.