Under Blackrock Mountain grate

[Iaccidentallytwink]

Nothing special; Just under some random grate in Blackrock Mountain by using the instance portal and rocket boots + parachute. Video below.

[Strangletusk]

Haha! Your timing on this is very coincidental - I was just in this area very recently, albeit, via offline mode (flew in from under the world), after I remembered a post about a 'lava cavern' under Blackrock Depths from a while back. 2011 in fact, they'd just flown in from under the world too, since you were of course able to do that to your hearts content without being d/ced back then.

+3 Rep for a nice method into the 'cavern', as well as behind the instance portal