Three people have been arrested after police raided a sophisticated tunnel intended to smuggle drugs under the U.S.-Canada border between Vancouver and Seattle, police said on Thursday according to Reuters. The smugglers spent more than a year building the 360-foot (110-metre) long tunnel that ran from a Quonset hut-style storage building on a property near Aldergrove, British Columbia to the living room of a home in Lyndon, Washington, investigators said. "It was well built, probably one of the most sophisticated tunnels we've ever seen. There was a significant drug trafficking organization that was responsible for the construction," said Rod Benson, an agent with the U.S. Drug Enforcement Agency. Video supplied by investigators showed the inside of the tunnel lined with wood supports and reinforced with steel. Investigators said that while more than 30 drug-smuggling tunnels have been uncovered in recent years on the border between Mexico to the United States this was the first discovered on the Canadian-U.S. border.