These include masks, fins, snorkels, buoyancy compensators, regulators and accessories. To date, every national and international standard on snorkels uses the term "snorkel" exclusively. Elephants sometimes swim underwater and use their trunks as snorkels. This spurred the development of modern swimfins, diving masks and snorkels. First it was cut from the wing by diving with snorkels and using hand-tools. Freshwater Snorks have two snorkels on their head and a distinctive biochemistry from saltwater snorks. The large snorkels for feeding the turbochargers were also replaced with a more discreet inlet. Many of these boats were fitted with snorkels in 1944 and 1945. Snorkels are attached to sockets on the top or the sides of the mask. The engines were to be provided with snorkels, also like those used by German submarines. US submarines did not adopt the use of snorkels until after WWII. For example, black mangroves survive in water-logged soil by using special "root snorkels" called pneumatophores. They proved very successful, though not initially fitted with snorkels. Snorkels were mounted on the rear of the turret. Snorkels come in two orientations&colon; Front-mounted and side-mounted.