Anything can happen at sea. You are eating your daily sandwich on the deck of the ship when suddenly some shark with its dorsal fin swollen from greed, or gigantic sly seagull, or a spicy storm that has just capsized a spice ship, attacks you. That is just the way it is at sea, and those storm are the absolute worst. But nevertheless, as opposed to other ships, one ship must always be at sea, even if it is raining stone herrings from the sky!