Courtesy: National Geographic Channel (In Tamil) <br /> <br />List Of Top 10 World's Most Extreme Tunnels. <br /> <br />Moscow's Leforttovo Tunnel also called as "The Tunnel Of Death", New York's 2nd Avenue Subway Tunnel, Vietnam's War Tunnels, USA's Nuclear Missile Silo "Safest Tunnel", China's Bund Tunnel "Weirdest Tunnel", <br />Guoliang Tunnel "Riskiest Tunnel", Afghanistan's Salang Pass Tunnel "Roughest Tunnel", Swiss Alps Gotthard Tunnel Network "Largest Tunnel", Japan's "Mightiest Tunnel, Underground Temple", Mexican's Infamous Drug Tunnels "Most Criminal Tunnel".
