Visitors, mostly Opel employees, former employees and their family members, walk through the Opel Insignia and Astra factory during a celebration marking Opel's 150th anniversary on September 22, 2012 in Ruesselsheim, Germany. The troubled carmaker, which has been owned by General Motors (GM) since the 1920s, is struggling to return to profits and reassert its brand imagery. (Getty Images)
From underwater mining to luxury yachts, Mohammed Al Barwani has interests in a staggering range of industries. The chairman of MB Holding explains how he built the firm from scratch to become a billion-dollar player.