The diving suit that Leonardo invented is pretty similar to a modern day diving suit. The suit is equipped with a bell of air that would float above the water, breathing hoses, a face mask, and two glass eye holes (pretty much the first goggles). Also, to ensure that the diver could stay underwater for extended periods of time, the suit was equipped with a bottle for the diver to relieve himself. The purpose of this suit however, was not recreational. Because of the bell, the depth the diver could swim to was limited. The intended use was for divers to cut holes in the bottoms of the enemies' ships in harbors.