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Atal Tunnel, built by the Border Roads Organisation, is the longest highway tunnel in the world.
The 9.02-km tunnel connects Manali to Lahaul-Spiti valley throughout the year, the Prime Minister’s Office has said, noting that the valley was earlier cut off for about six months every year due to heavy snowfall.
Modi was accompanied by Defence Minister Rajnath Singh and Chief of Defence Staff Gen Bipin Rawat.
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The Modi government decided to name the Rohtang Tunnel as Atal Tunnel in December 2019 to honour the former prime minister who had passed away the previous year.