Secret Tunnels from Mexico to the US for Smuggling Drugs, Guns, People

Mexican civil engineer Luis Carlos Ayala-Gonzalez was arrested in 2008 for his alleged role in building a tunnel under a house in San Luis, Arizona. ICE agents found plastic tubing, drilling equipment and journals describing the construction of a tunnel. The tunnel was discovered by a Border Patrol employee who saw cement coming out of a ventilation hole. In November 2009, Ayala-Gonzalez was convicted of one count of aggravated assisting in a criminal syndicate and sentenced to three years in an Arizona state prison. (U.S. Immigration and Customs Enforcement)