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find the first references to these techniques in ancient Greece (360 BC). The historian and philosopher Aristotle referred to in his "problematic," a device that could be from an air bag or cap to a diving bell. By your description it's likely to be a bell to which Aristotle himself called "Lebeta" or "cauldron".

Apart from the classic tales, the first rudimentary mills known through the stone carvings found in the Assyrian temples. In ancient Thebes, the temple of Deir el-Bahari, there are stone reliefs you underwater explorers accounts of Queen Hatshepsut, in the ninth century BC C. Where they show men swimming under water, feeding air to it contained in a skin of leather that hold with one arm.

The Crusades

also known that during the Third Crusade, was an Egyptian by the name Issa service of Saladin, who was in charge of swimming under the Christian fleet vessels to exercise besieging Acre messenger. Issa should reference the engravings of Deir-el-Bahari, and employing a full coat of air allowed to make their journeys submerged and without rising to the surface, where it could be easily discovered by enemy ships. As we can see, these skins or leather skins are loaded air, with slight variations, modern dive bottles that are used today.

Already in the twelfth century there are references to crude pumping systems, which allow extending the immersion time. Bohaddin The Arab historian, recounted that during the siege of the city crossed Ptolomais, Arab diver managed to penetrate the city using diving apparatus allowing him to receive air from the surface and he called the "bellows" or "jug." Unfortunately does not describe the device used, but presumably it was a kind of tube through which air is pumped aspired from the outside.

wetsuit

Already in the thirteenth century, we find the first full prototype suit diver. Kyes German author described in 1405 a suit to work underwater, consisting of a leather jacket with a metal helmet fitted with two glass windows. The jacket and helmet were lined with a spongy material for better air retention. The upper Hull came a leather tube connected to an air sac.

The contributions of Leonardo Da Vinci

Even the great Leonardo Da Vinci made his first steps into the world of underwater equipment design. In 1500, several elements designed for diving and wrote several treatises on it. Unfortunately, these designs were stolen at the time by Napoleon during his campaign in Italy.

Two of the models designed by the Italian inventor represent a simple respiratory ara use in shallow water. Is a sort of molded mouth to mouth, attached to the surface through a duct similar to the current airway. Thus, this mechanism could be what we now know as the mouthpiece of the tube or the regulator.

also Da Vinci could also claim "patent" of the face mask, as another of her designs displays a kind of full helmet and goggles, complete with a breathing tube to the surface. The same applies to the fins, a device to which the Italian inventor and then attributed much importance in the equipment of a diver.