Atal Tunnel - World's Longest Highway Tunnel | It Happens Only in India | National Geographic

Connecting Leh to Manali, the 9 kilometer long Atal tunnel is a magnificent work of modern engineering that is simply like no other. For more rides along such fascinating tunnels, join us on the new season of It Happens Only in India, every Sunday at 8 PM, on National Geographic. #NatGeoIndia
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