A tasseled wobbegong shark (top) lies on the seafloor with the head of a brown-banded bamboo shark in its mouth on the fringing reef of Great Keppel Island on Australia's Great Barrier Reef in August 2011. Reuters/Landov hide caption

itoggle caption Reuters/Landov

Troops from the EU Naval Force warship FS Aconit intercepting a group of suspected pirates off Somalia in March 2012. Multinational naval patrols in the area have been partly credited with reducing incidents of piracy. Danile Costantini/Maxppp/Landov hide caption

itoggle caption Danile Costantini/Maxppp/Landov

Men sit by the side of the Panama Canal as a ship sails past in Gamboa near Panama City, last month. The expansion project is aimed at accommodating the world's largest container ships. Arnulfo Franco/AP hide caption

itoggle caption Arnulfo Franco/AP

Laborers stand on a new ship at a Rongsheng Heavy Industries shipyard in Nantong, China, in 2012. The troubles at Rongsheng, China's largest private shipbuilder, mirror what's happening in the global industry. Aly Song/Reuters/Landov hide caption

itoggle caption Aly Song/Reuters/Landov