Damage is seen on the Doola 3, an oil tanker carrying petroleum, after it exploded in waters off South Korea's western port city of Incheon January 15, 2012. An explosion struck a cargo ship carrying petroleum in waters off South Korea's western port city of Incheon on Sunday, killing five people, the coast guard said. Six crew were missing. [Photo/Agencies]

Boats of the South Korean Coast Guard patrol near the damaged Doola 3 (C), an oil tanker carrying petroleum, after it exploded in waters off South Korea's western port city of Incheon January 15, 2012. [Photo/Agencies]