A drug-smuggling tunnel equipped with electricity, ventilation and a rail system has been found connecting San Diego, California, and Tijuana, Mexico. Authorities seized more than eight tons of marijuana and 325lb (147kg) of cocaine in the discovery. Officials have not revealed the exact length or location of the recently finished tunnel, but Mexican media report it is near Tijuana's airport. More than 75 such secret tunnels have been discovered since 2008.