The Backdoor
The Backdoor is a quest for level 10-45 in Highmountain. It is step 6 of 7 in the Secrets of Highmountain storyline. The quest's turn-in marker is in Suramar at 41.9, 12.9. It rewards 1 reputation reward, 6,150 experience and money. Completing it counts toward 2 achievements.
Description
This will take Mayla some time to adjust to.
That being said, we should return to Thunder Totem.
Just south of here is a tunnel that should take us through the old drogbar slave enclave and then to an opening beyond.
We keep a small Skyhorn outpost there to watch and ensure nothing enters or leaves this vault without us knowing about it. They should be able to fly us back.

