In these modern days, any cruise ship is like an enormous city, where every little detail is thought out so that passengers feel just as comfortable as home, only better. You can also take a shower, do the laundry, or have a dip in a swimming pool. But where does all the wastewater go? Into the ocean? The average ship spends about 40-50 gallons of water passengers every day. It makes huge amounts of wastewater that needs to be used. Say, the world’s largest cruise ship, Harmony of the Seas, can carry about 5,500 passengers plus 2,300 crew members. They make about 312,000 gallons of wastewater daily! But where does all that water go? Check out this and more in one very informative video below: