Why would anyone want to go on a cruise with 6,000 other people? That ship looks like a floating tower-block. Imagine a breakdown of the toilet system.
I remember that, some years ago, a cruise ship suffered a stabilizer failure, resulting in enough rolling to cause the toilets to explosively backflow into the cabins. Much vomiting and illness among the passengers. The same ship also ran aground within a few months of this incident, but I can’t remember its name.