For Holland America’s Eurodam, 13 has proven to be a lucky number. The ship recently earned its whopping 13th consecutive perfect health score on a surprise inspection. This is the third perfect score for the ship this year, and continues its impressive six-year run of perfect scores of 100. This is a record not only in company history, but in the cruise industry as a whole.

Eurodam‘s United States Public Health inspection was held on December 3 during a turnaround at Port Everglades in Fort Lauderdale, Florida at the beginning of a seven-day Caribbean cruise. Sister ships Koningsdam and Oosterdam also achieved perfect scores this year, in March.

Over the past four years, Holland America ships have achieved perfect scores of 100 over 22 times. CDC inspections were introduced in the early 1970s and are required for all passenger ships that call in a US port. They are unannounced and are carried out twice a year. The score is on a scale from 0-100 and is assigned on the basis of a checklist with dozens of areas of assessment, including sanitation of food, galley cleanliness, water, shipboard personnel, and the vessel as a whole.

For more about Eurodam, check out our series of Sea Blogs from a recent cruise aboard the ship here.