Rohtang Tunnel Project: The world’s longest highway tunnel above 10,000 feet, Atal Tunnel, connecting Manali to Leh, is likely to open soon! It is being said that the ambitious infrastructure project will be inaugurated by Prime Minister Narendra Modi in the last week of September. The strategically important infrastructure project, the Rohtang Tunnel has been named after former PM Atal Bihari Vajpayee. It has been built at a cost of around Rs 3,200 crore. According to KP Purushothaman, Chief Engineer of the project, the estimated period for completion of the Atal Tunnel was less than six years but it was completed in 10 years, ANI reported.