Mount Sinabung spews pyroclastic smoke as seen from Tigapancur village in Karo district on November 14, 2013 in Medan, Sumatra, Indonesia. Up to 4,300 residents have been evacuated from five villages in North Sumatra due to the volcanic eruptions of Mount Sinabung. The volcano has been erupting for several days, spewing ash and lava 2.5 miles into the sky. (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.