Speak with Fringe Engineer Tezzla.
Tezzla is the one you want to meet, yes she is... she mastered a new wavelength, infra-green, and used it to hide herself near the Scourge! Near enough to bomb them!
I'll give you infra-green vision so you can find her hiding above Aldur'thar, the Desolation Gate. Go, go... I know she has work for brave heroes eager to blow up! I mean... eager to blow up the Scourge!
And [player], the Alliance has stolen our technology and has their own hidden airport nearby. Avoid the dome with the Alliance banners!