The U.S. Coast Guard in Northern California seized $181 million worth of cocaine in the largest drug bust of its kind, according to a statement released by the organization Wednesday.The team raided a semi-submersible vessel carrying 16,000 pounds of narcotics 200 miles south of Mexico in the Eastern Pacific Ocean on July 18.Approximately 4,000 pounds of cocaine, which the team purposely left in the vessel to stabilize it, was lost while towing the vessel so, authorities only seized 12,000 pounds.