Atal tunnel, previously known as the Rohtang Tunnel is named after the former Prime Minister Atal Bihari Vajpayee and is an Expressway burrow that is being built under the Rohtang Pass in the Eastern Pir Panjal scope of the Himalayas on the Leh Manali Highway. At 9.02 kilometres length the passage will be one of the longest street burrows in India and is at a height of 3060 meters, while the Rohtang Pass is at A Rise of 3978 metres. So what are some of the main benefits that will accrue to the region with it's formal opening to the public? The main reason for building the tunnel lies in the fact that the Manali-Sarchu Leh Street stays shut down for half the year due to Rohtang Pass being totally snowbound during November and April. Upon completion, the all climate passage will interface Manali to lahaul and Spiti Valley consistently and will diminish the street length of Manali Rohtang Pass Sarchu Leh street by 46 kilometres saving a total time of 4-5 hours of travel. Furthermore, it will boost the economy and tourism of the area.The planning for the construction of the tunnel started way back in 1983 when the Government of India settled to update the Manali-Leh street to an all climate pivot. In 2002, Prime Minister Atal Bihari Vajpayee announced the development of Rohtang tunnel establishing the framework of the methodologies to the passage. The examination of the site was done by RITES in March 2002. On September 24, 2009 an agreement was granted to STRABAG AFCONS joint venture. The construction started off under the administration of Smt. Sonia Gandhi. The development of the tunnel started in 2010 with the first shoot occurring at the South Portal close to Dhundhi on August 29, 2010 which is located 25 kilometres from Manali at a height of 3060 metres and in North Portal on October 4, 2010 which is situated close to town Teling Sissu in Lahaul valley at an elevation of 3071 metres. The total length of the Rohtang Tunnel is 8.802 kilometres. It is a horseshoe formed, single tube two fold path burrow with 10.5 metres street. There is an overhead clearance of 5.5 to 5 metres and the maximum vehicle speed is 80 kilometre per hour. Because of tough geographical factors like the construction of the Seri Nala Tunnel it has taken really 10 years for the 8.8 kilometre tunnel to be completed. So what were the primary engineering challenges encountered during the construction of the tunnel? The construction was highly challenging due to the geological complexity of The Young Himalayas. The varying geology contributed to overburdening, exceptionally large cross-sectional areas and tunnel squeezing conditions. Rocks falling also known as bursting led to serious stability and safety problems. Despite several challenges the project has made some commendable achievements and is expected to be inaugurated soon by Prime Minister Narendra Modi. Started on June 28, 2010, an engineering marvel - The Atal Tunnel is going to be the world's longest Road tunnel at such a high altitude and is a giant leap towards India's infrastructural development.