I've seen it. Yes it can be life threatening, believe it or not. I haven't heard of anyone dying from it, but I can sure imagine it. Many years ago I set out with a friend for Hawaii
from Santa Barbara. He knew he had a problem with sea-sickness but believed he would get over it. 2 and a half days out and he still had not gotten out of his bunk, he had not been drinking, eating or using the head
. So I was singlehanding
with someone who's condition was bad and getting worse. When I finally said I think it's better to head
back, he agreed without hesitation, but he remained in his bunk until we arrived back home. It took him a while to really recover. Just recently on a 24 hour delivery
I had to drop off the owner and his friend about half way because they were just too sick to really go on, and they have been on many shorter trips with me before. Dramamine, Bonine or whatever, if it works, take it!