Submarine could have hauled 6 to 10 metric tons of cocaine , DEA says . The $ 4 million vessel was built at a clandestine complex . Sub is first of its kind found by drug agents , DEA says . `` The advent of the narco-submarine presents new detection challenges for maritime interdiction forces . Comment:
Submarine could have hauled 6 to 10 metric tons of cocaine , DEA says . The $ 4 million vessel was built at a clandestine complex . Sub is first of its kind found by drug agents , DEA says . Comment: