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Every five years, cruise ships go into dry dock for not only routine maintenance, but also for upgrades and renovations to the ship. The ships receive routine hotel maintenance (new beds etc) and cosmetic upgrades in public areas that include lighting, new carpet, tile work, and wall coverings.
Lately, cruise lines have used this dry dock period to add upgrades to the ship that include new specialty restaurants and lounges, new staterooms and suites, water slides/waterparks, and giant outdoor TV screens to ships that do not have them.
Below are the dry dock schedules that have been announced for the mainstream cruise lines in 2017-2018.