 In March 2006, the Calabrian Mafia ('Ndrangheta) ordered a shipment of 9 tonnes of cocaine to be transported by a narco-submarine from Colombia to Italy, but the vessel was discovered by the Colombian police while it was still under construction.During 2007, thirteen of the vessels were seized on Colombian dry land or stopped at sea by Colombian or U.S. patrol boats, more than in the previous fourteen years combined, but arrests are rare.When clandestine shipyards were discovered, workmen escaped into the jungle.