GUATEMALA CITY, (Reuters) – U.S. and Guatemalan  authorities captured a makeshift submarine loaded with an  estimated 10 tonnes of cocaine in the Pacific Ocean off  Guatemala, Guatemalan police said yesterday.  

Four men aboard the vessel — three Colombians and a  Mexican — were arrested when it was detained Wednesday night  by U.S. anti-drug agents and the Guatemalan Coast Guard some  175 miles (282 km) off Guatemala’s Pacific Coast.  

If the size of the seizure is confirmed, it would be the  largest ever drug bust in Guatemala, which is becoming an  important transit point for illegal drugs moved north by  powerful Mexican trafficking cartels.