I remember a rogue wave. Came off our stern, and the poor sailor who was the stern watch was waist deep in water.
My squadron had a ship head into Japan to have repairs done, and two sailors went to the stern to do some maintenance. Rogue wave came, the railing didn't keep 'em onboard. They retreived one sailor with a broken arm. We spent two days searching, but never found the other.
My first cruise to the Mediterranean, on a navy destroyer, saw swells up to 100 or more feet. No damage and no reports of damage to other ship in the sixth fleet. We never saw that kind of water again.