MIAMI (Reuters) - US authorities have recovered nearly 15,000 pounds of cocaine worth an estimated $180 million from a sunken submarine-like vessel used by smugglers off the coast of Honduras, the Coast Guard said on Monday. The crew of the Boston-based Coast Guard Cutter Seneca intercepted a self-propelled semi-submersible vessel off the Caribbean coast of Honduras on July 13. Authorities detained the vessel's crew and recovered some drugs before the boat sank, the Coast Guard said. Several Coast Guard cutters, the Honduran Navy and FBI dive teams then used side-sonar equipment to search for the sunken submarine-like vessel, which was located on July 26.