<p><em>ON TV: </em><a href="http://channel.nationalgeographic.com/episode/cocaine-sub-hunt-5604/Overview">Cocaine Sub Hunt</a><em> premieres at 9 p.m. ET/PT on Sunday, June 26, on the National Geographic Channel.</em></p><p><strong>A recently discovered drug-smuggling submarine lies half submerged, deep in a mangrove swamp in <a href="http://travel.nationalgeographic.com/travel/countries/colombia-guide/">Colombia</a>. The diesel vehicle is the first fully submersible drug sub ever to be captured by U.S. Drug Enforcement Administration (DEA) in the South American country.</strong></p><p>(Also see <a href="http://news.nationalgeographic.com/news/2010/07/photogalleries/100713-cocaine-submarines-subs-smuggling-drugs-world-crime-pictures/">"Cocaine Submarine Pictures: New Seizure Shows Advances."</a>)</p><p>The hundred-foot-long (30-meter-long) fiberglass sub can carry a crew of six underwater for more than a week, dive some 30 feet (9 meters) below the surface, and ferry about eight tons of drugs worth an estimated quarter of a billion U.S. dollars.</p><p>"That's a far greater payload than a speedboat can transport and certainly more than a human drug mule can carry in their stomach," said Steven Hoggard, the writer and director of a new National Geographic Channel documentary detailing the DEA agents' hunt for the sub. (The Channel is part-owned by the National Geographic Society, which owns National Geographic News.)</p><p>(Related: Get<a href="http://articles.latimes.com/2010/jul/06/world/la-fg-ecuador-narco-sub-20100706"> cocaine-submarine pictures and facts</a> from the National Geographic Channel.)</p><p><em>—Ker Than</em></p>