For example , in 2015 the largest cargo of 7.7 tonnes ( 17,000 lb ) was seized on a semi-submersible which had been tracked by aircraft .
Cargoes carried are typically several tons of cocaine .
In 2015 the largest cargo of 7.7 tonnes ( 17,000 lb ) was seized on a semi-submersible which had been tracked by aircraft .
Cargoes carried are typically several tons of cocaine .