In 1860, the Moravian Mission debated the feasibility of digging a tunnel across Rohtang Pass to access Lahaul. Nonetheless, the project was not initiated until June 3, 2000, when Prime Minister Atal Bihari Vajpayee further proposed this idea. On May 6, 2002, BRO was commissioned with the task. Sonia Gandhi laid the project's foundation stone on June 28, 2010. On December 25, 2019, the trench, which had previously been referred to as the Rohtang Tunnel, was formally redesignated the Atal Tunnel whose construction work was completed in September 2020. On October 3, 2020, Prime Minister Narendra Modi inaugurated the tunnel and opened it for all the visitors officially.

The horseshoe-shaped tunnel was accomplished by utilizing the latest Austrian Tunneling Method as well as features a semi-transverse ventilation system with huge fans that pump air separately across the trench. For emergency evacuation, a 2.25 meters tall and 3.6 meters wide emergency tunnel has also been built further into the tunnel pass underneath the main highway. Pollutant sensors keep monitoring the tunnel's air quality index, and if it falls below a certain threshold, clean air is fed into the corridor by two heavy-duty blowers across each end of the tunnel. The permitted speed of the vehicle is around 80 km/hr. Due to the sheer incapacity to see through the mountains, tunnel boring equipment was not employed to establish the tunnel, rather blasting and digging methods were used.

• Appreciate a day excursion to Atal Tunnel Rohtang, the world's longest road tunnel over 10,000 feet, which itself is nestled among snow-laden Himalayan peaks and a picturesque landscape. 
• This journey will take you on to an incredible 24 km ride from Manali to Solang Valley and Dhundi, via verdant forestland with the Solang creek trickling by the right-hand side. 
• Users may take a sedan or even an SUV, depending on the size of your company or your journey requirements. 
• Your vehicle will be cleaned and examined. This will be handled by a licensed driver who would also pick you up and drop you off at your Manali lodging.
• After finishing the Atal Tunnel trip, travelers either can return to Manali through Dhundi and Solang valley, or they might visit Rohtang Pass and afterward return via Marhi, Gulaba, and Kothi.

• Warm clothing is essential throughout the summertime and monsoon seasons, whereas thick woolens are necessary during the winter and spring season seasons.  
• Eyeglasses to shield your eyes from the gleaming snow, and sunblock to prevent sun sunburn are recommended. 
• Visits to the tunnel can be halted during winter. 
• In addition, the Rohtang Pass stays closed during the winter months. As a result, travelers must visit and then return to Manali via the Solang valley route exclusively.
   

Tourists can access the tunnel at any moment of the year. The region's flora will enchant you in the early summer, and rainy seasons, while the yellowing foliage on trees will astound you in the autumn. In the cold season, snow makes it more attractive, and the passage becomes a tundra point for tourism activity. Pedestrian traffic to the tunnel is, however, halted during snowfall as a protective measure.

• Ghatotkacha Tree Temple
• Mall Road
• Solang Valley
• Hadimba Temple
• Lahaul Valley
• Rahala Falls
• Manali Sanctuary 
   

• This shortens the route mileage of Manali and Leh by 46 kilometers and the travel duration by 4 - 5 hours. 
• There are 18 evacuation tubes, with an opening every 500 meters for emergency situations. 
• The South Portal (SP) of the tunnel is positioned 25 kilometers from Manali upon a height of 3,060 meters, whereas the North Portal (NP) is situated close to the hamlet Sissu, in Lahaul Plateau upon an elevation of 3,071 meters.