Quote Originally Posted by Yoohre_WildRiver View Post
where is this tunnel, i shall walk there, explore it, take pictures of it and call it steve
This is from memory (my client crashed, and I can't get back in), so may not be perfectly accurate!

That said, head south from the Halatali aether gate, and just a little bit east. The green dot from the NPC at the entrance should be visible in the mini-map. He is down inside the beginning of the tunnel complex. There are two short tunnels, both of which lead down to him. It is in an open area -- no walls or cave complexes.

This area has been here since release, but is now surrounded by antlings (since 1.18), leading to my speculation. Enjoy!