 Fredriksen would later become the world's largest tanker owner, with more than seventy oil tankers and major interests in oil rigs and fish farming.His fleet is dominated by costly double-hulled, environmentally safer tankers.In 2006, Seadrill bought more than 50 percent of Smedvig, gaining control of the company (51.24 percent of the votes and 52.27 percent of the capital).