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Bluewater Network provides links to reports about the cruise ship industry. You can explore tourism's dark underbelly by visiting Bluewater's link to http://www.cruisejunkie.com/ . You'll find information about violations, fines, outbreaks on board and people gone overboard.
The Centers for Disease Control and Prevention provides health scores, details about violations of regulations and - more encouraging - updates on corrective measures taken by the cruise lines inspected.