After finding evidence that drug cartels were using submarines to ship narcotics in the Pacific Ocean, authorities say they have seen increased use of the craft in the Caribbean as traffickers move away from high-speed boats to smuggle their product. The drug smugglers build the submarines in hidden locations deep in the jungles of South America, and American law-enforcement officials say that the craft they have found in use recently are more sophisticated and less detectable than ever before, capable of traveling from South America to the United States completely underwater.
