All ships do this in international waters. We are talking about cruise ships. What do you think Navy ships do?
When I was in one of my duties was maintaining the pumps and tanks. When we hit international waters and those tanks got full I would hit a switch and that shyt got pumped right into the ocean. I was on a Destroyer. About 300 people. A carrier can have 5000 sailors. They don’t have tanks big enough to hold all that shyt. It’s going in the water