Drug Cartels' Secret Weapon

This submarine-like craft was captured by the Colombian Navy in July 2007 off the Pacific coast of Colombia. These vessels have become a secret weapon of cartels because they are extremely difficult to detect, especially from the water. The vessels are almost submersed, can evade radar reflections, and usually are painted to blend in with the water. The U.S. has been most effective at spotting submersibles from the air. (DEA)