After Breakfast Proceed to Atal Tunnel aka Rohtang Tunnel, built under the Rohtang Pass, that took around 10 years to be fully operational, has become the most famous attraction for everyone who is visiting Manali. At a length of 9.02 kms, Atal Tunnel is the longest tunnel above 10,000 feet, and cuts the travel time between Manali and Leh by around 3-4 hours. You enter the tunnel in Manali and end up in the Sissu, Lahul Valley. And the very fact that you can travel from Manali to Sissu in 15-20 minutes via the Atal Tunnel is what has turned Atal Tunnel into the most talked about attraction in and around Manali