The Mexican Navy found five tons of cocaine hidden in frozen shark meat aboard a ship bound for the United States, during a weekend raid that dealt a hefty blow to the drug cartels, according to dpa. The drugs were hidden in two containers onboard the Dover Straits, a freight ship sailing under the flag of the Marshall Islands from South America to the US, Mexican daily El Universal reported Wednesday. The haul of drugs, the largest in recent years, took place in the Puerto Progreso harbour on the Yucatan Peninsula. Port authorities had been tipped off about the suspicious load, the Navy said in a statement late Tuesday. They found bags of cocaine inside the frozen sharks. Over the years cartels have used increasingly creative methods to smuggle drugs into the lucrative US and European markets. They hide narcotics in cars, boats, planes and even submarines, and often use frozen animal meat.