 In 2009, the United States detected as many as 60 narco-submarine related events, and it was calculated that they were moving as much as 330 tonnes of cocaine per year.On June 1 and 2, 2009 the Colombian authorities seized three narco-submarines on the shores of the Pacific coast, one of them loaded with 1.5 tonnes of cocaine.The Colombian navy had intercepted or discovered 33 narco-submarines by 2009.