The study of Leonardo on the possible permanence of underwater did not constitute in itself a novelty and is already in the codes if they illustravano medieval modes, although a little 'rudimentary, and the same engineers went sperimentandolo contemporaries, as the great humanist architect Leon Battista Alberti. But nobody knew how Leonardo define and prefigure solutions modern prepare for this astonishing achievement. In fact, he introduced several times, with surprising originality, the equipment and devices necessary for breathing underwater a palombaro, where the Diving Bell, made in leather, was to be a perfect seal, entrusting to a large bag and pectoral rigonfia a valve that regolasse air, the chance to get off or to make a rapid ascent, once freed from the ballast. In addition, the artist puts into the budget document palombaro a respirator to allow him to communicate with the outer surface through hoses, whose terminal area was protected by a cap float.
C. 1508. Code Arundel