The phrase "how much cruise ship is under water" refers to the depth of a cruise ship's hull below the waterline. For instance, a typical large cruise vessel may have a hull depth of around 20-30 feet below the surface.
Understanding the depth of a cruise ship's hull is crucial for navigation, stability, and safety at sea. It allows seafarers to gauge the clearance they have when passing through shallow waters or navigating near obstacles. Historically, the development of deeper hulls has enabled cruise ships to accommodate larger passenger capacities and offer greater stability.