Submarine being held near Ecuador-Colombia border . `` The advent of the narco-submarine presents new detection challenges for maritime interdiction forces . Authorities : Vessel was built to `` facilitate trans-oceanic drug trafficking '' and is now used for smuggling cocaine into the United States from South America. Agents seized sub before its maiden voyage .
Submarine being held near Ecuador-Colombia border . Authorities : Vessel was built to `` facilitate trans-oceanic drug trafficking '' and is now used for smuggling cocaine into the United States from South America. Agents seized sub before its maiden voyage .