Constraints: The channel crossing is often rough; no pregnant girl, no one with neck or back injuries, and no kids below 5 are permitted. Entire face snorkels aren't allowed. That won't ever materialize, he insists. “Our flights are made not to intrude to the men and women on the island,” https://niihau-boat-tour22221.ziblogs.com/34968750/a-simple-key-for-snorkeling-niihau-island-unveiled