Master Marine Shipyard, founded in 1961, specializes in vessel conversions, repairs, overhauls, and repowering. Navy personnel and Master Marine Shipyard workers are at high risk for developing a disease due to asbestos exposure. Shipyard workers were exposed to asbestos when loading and unloading cargo, during the ship's construction, and during maintenance. When asbestos-containing materials are disturbed, dust and fibers are discharged into the air, which may be inhaled. Over time, this exposure may result in significant asbestos-related disorders such as mesothelioma, lung cancer, asbestosis, and pleural thickening. Shipfitters, machinists, electricians, boilermakers, and painters, were among the shipyard occupations that were directly exposed to asbestos.