DIVERS are Men with great physical strength, with healthy organs. There is no second profession, with so great requirements of physical capability, like the profession of a diver - not only occasional. To carry the nearly 200 pounds heavy equipment outside the water, or to move this mass while walking underwater, the breathing while fast changing pressure and, last not least, working with all strength within a not at all safety air supply, require athletic muscles, healthy lungs, strong heart and faultless function of all organs.