U.S. Coast Guard Cutter Munro Interdicts Suspected Drug Smuggling Submarine

U.S. Coast Guard Cutter Munro (WMSL 755) crew members board a self-propelled semi-submersible suspected drug smuggling vessel (SPSS) June 18, 2019, while operating in international waters of the Eastern Pacific Ocean. Purpose-build smuggling vessels like SPSSs are designed to hold large quantities of contraband while evading detection by law enforcement authorities. (U.S. Coast Guard video)