The inspection of the outside of the ship's bottom is a separate survey.
For passenger ships the inspection is required every year. In the years in which the out-of-water inspection does not take place, an in-water inspection of the ship's bottom must be carried out. As a minimum, two of these surveys in any five- year period, at intervals not exceeding 36 months, must be conducted with the ship out of the water. ("Any five-year period" means the period of the International Load Line Certificate.)
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