By July 10th only one cruise line (Bahamas Paradise), which operates just one cruise ship in U.S. waters, had submitted a response plan which complied with the CDC's requirements in its extended NSO. Substantial, Ongoing Failure to Comply with the CDC The CDC provided numerous examples of the cruise industry's substantial, ongoing non-compliance with the extended NSO. The CDC found that numerous cruise ships were: The CDC sent a letter to all cruise lines requesting that they respond to the agency's concerns. Only Royal Caribbean and Virgin Voyages bothered to respond. The CDC then sent a letter raising specific dates on non-compliance on several ships operated under the Norwegian Cruise Line Holding's umbrella, namely the Norwegian Escape, Norwegian Epic, Norwegian Joy, Oceania Marine and Seven Seas Voyager.