MasterJCIn the latest World of Warcraft: The Magazine Interview, When Game Designer, David Kosak, was asked what quest was he most proud of making, He stated without giving too much away, that he was most proud of doing the South Barrens, especially Bael Modan. 'A lot of epic things are going to happen there that I am immensely proud of. Some beautiful, beautiful things.'
According to quest text it apparently took part in the bombing of camp Taurajo. With help from a dying Gann Stonespire and a goblin rogue called Weezil Slipshadow the player sabotages a dwarven artillery shell for the giant cannon erected around Bael'dun keep causing the whole place to go sky high.[7][8]
Something bad is beneath the BarrensEdit
In the Cataclysm Beta and in the release version a Bael'dun Excavator standing before the cave can be interacted with by Alliance players and he says something interesting:
Turn away, <class>.
Before the cataclysm hit, we found something.
We dug something up that should've stayed buried.
Pray to whatever you believe in that the landslide was enough to keep it down...[9]
http://wowwiki.wikia.com/wiki/Bael_Modan