WoWDB

Although you could run in on the PTR, the current wall of flames over the mouth of this cave makes this difficult for people to get to.

If you are a warlock, you can use your  Eye of Kilrogg to go inside and set down a  Demonic Circle: Teleport.  If you are a mage, you can use  Blink (note: I have heard mixed things about  Blink working).

Another option is if you have any "chair" like objects in your toybox (like  Safari Lounge Cushion or  Mushroom Chair).  Push yourself face first into the flames, set down the item, and then sit in it.  When you "exit vehicle" you will be on the other side of the wall.  As a note, you will need either a second toy or wait on the cooldown to exit the flames in the same manner.