Safety of Tourist SubmersiblesSafety of Tourist Submersibles Over the past four years more than three quarters of a million tourists have viewed the colorful coral lined seas off the U. S. coasts while sitting comfortably in submersibles designed to carry over 40 passengers. Seven tourist submersibles have been operating in U. S. waters, and their safety record has been good. The primary concern, however, is that regulations and procedures will ensure that future submersibles