Inside Spain's Narco Submarines

Drug seizures across Spain are on the rise, with more than 90 million tonnes seized last year. Most is found in shipping containers and ports, but in the coastal region of Galicia, Guillermo Galdos discovers a network of seasoned smugglers operating under the police's radar. As cocaine production surges in Latin America, authorities in Spain are increasingly on the lookout for small so-called 'narco-subs' - home-made contraptions, each capable of carrying tonnes of cocaine across the Atlantic to Europe.