Watch | World’s longest highway tunnel connecting Manali with Leh ready The construction of the 9.2-km Atal Tunnel that connects Manali with Leh, the world’s longest highway tunnel above 10,000 feet, has been completed in a span of 10 years whereas the original estimated time was less than six years. “There are CCTV cameras at every 60 metres and emergency exit tunnels at every 500 metres inside the tunnel. The tunnel will reduce the distance between Manali and Leh by 46km and four hours can be