 In the first six months of 2008, the U.S. Coast Guard and U.S. Navy detected 42 drug subs heading north towards the United States and off the coast of Central America, but few seizures resulted.The service estimated that 85 individual events would bring in about 544 tonnes cocaine by the end of 2008.On July 16, 2008, the Mexican Navy intercepted a 10 m-long narco-submarine travelling about southwest of Oaxaca.