Cruise line: Royal Caribbean International Date of most recent inspection: April 6, 2019 Read more: A former Royal Caribbean employee reveals the one question you should always ask cruise ship workersCruise line: Celebrity Cruises Date of most recent inspection: February 11, 2019 Read more: Royal Caribbean just opened a $250 million private island for its cruise passengers that has a 135-foot-tall waterslide — here's what it looks likeCruise line: Royal Caribbean International Date of most recent inspection: February 9, 2019Cruise line: Norwegian Cruise Lines Date of most recent inspection: December 10, 2018Cruise line: Disney Cruise Lines Date of most recent inspection: December 7, 2018Cruise line: Seabourn Cruise Line Date of most recent inspection: November 4, 2018Cruise line: Viking Ocean Cruises Date of most recent inspection: October 15, 2018Cruise line: P&O Cruises Date of most recent inspection: September 24, 2018Cruise line: Holland America Line Date of most recent inspection: August 29, 2018Cruise line: Princess Cruises Date of most recent inspection: August 19, 2018Cruise line: Disney Cruise Lines Date of most recent inspection: August 17, 2018Cruise line: Aida Cruises Date of most recent inspection: June 25, 2018Cruise line: Celebrity Cruises Date of most recent inspection: November 26, 2017Cruise line: Costa Crociere SpA Date of most recent inspection: October 14, 2015Cruise line: MSC Cruise Management (UK) Limited Date of most recent inspection: January 6, 2009Cruise line: Royal Caribbean International Date of most recent inspection: December 3, 2017Cruise line: Norwegian Cruise Lines Date of most recent inspection: March 29, 2016Cruise line: Princess Cruises Date of most recent inspection: February 8, 2018 Cruise line: Princess Cruises Date of most recent inspection: March 25, 2018Cruise line: Seabourn Cruise Line Date of most recent inspection: December 5, 2017These are the 8 nastiest cruise ships Read more: Cruise ship workers reveal what it's really like to live at sea Cruise-ship workers describe the tiny cabins they live in, where up to 4 people can share a tight space Cruise-ship workers reveal the 7 most annoying things passengers do Royal Caribbean just opened a $250 million private island for its cruise passengers that has a 135-foot-tall waterslide — here's what it looks like