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Si trova a 4'750 metri sul livello del mare, ed è il tunnel scavato nel punto più alto. Attraversa la montagna Mila, in Tibet e collega la capitale della regione, Lhasa, con Nyingchi. Ci sono voluti 4 anni e oltre 2'000 operai, che hanno lavorato in condizioni estreme: freddo, mancanza di ossigeno, senza dimenticare la fatica per portare in quota materiale edile e beni di prima necessità.
Durante i lavori è stata messa a punto una decina di innovazioni tecnologiche, proprio per far fronte a freddo e altitudine. Il tunnel, a due vie, è lungo 5,7 chilometri, ci vogliono 4 minuti per attraversarlo. L'autostrada è un importante via per raggiungere la parte orientale del Tibet. L'opera è stata voluta per favorire il turismo, lo sviluppo industriale e facilitare la popolazione locale negli spostamenti.
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