The term 'cruise milieu' refers to the environment of a cruise ship, which typically includes the SEA, OCEAN, and open seas. The SEA is a large body of salt water, usually divided into smaller areas such as the Mediterranean SEA or the Caribbean SEA. The OCEAN is a vast expanse of interconnected waters, covering more than 70% of the Earth's surface. Open seas are areas of the OCEAN that are not enclosed by land, such as the Atlantic OCEAN or the Pacific OCEAN. Together, these three elements form the cruise milieu.