? The Atal Tunnel, which is 9.02 kilometres long, was constructed to connect Manali to the  Lahaul–Spiti Valley in Himachal Pradesh. ? The Atal Tunnel has been named after former Indian Prime Minister Atal Bihari Vajpayee. ? The Atal Tunnel was dedicated to the nation by Prime Minister Narendra Modi on 3 October  2020. ? The World Book of Records is a non-profit organisation that catalogues and authenticates  extraordinary records around the world. ? World Book of Records: Headquarters: London, United Kingdom. ? The Atal Tunnel in Rohtang, Himachal Pradesh, India is the World’s longest highway tunnel. ? The tunnel is built in the Eastern Pir Panjal Range of the Himalayas. ? Length = 9.02 kilometres long. ? It connects Solang Valley near Manali to Sissu in Lahaul and Spiti district. ? The tunnel is built in the Eastern Pir Panjal Range of the Himalayas. ? Constructed by : Borders Road Organisation (BRO).