Quartermaster Holgoth at Warsong Hold wants you to use the Seaforium Depth Charge Bundle to destroy the Nerub'ar sinkholes to the south, east, west and north of Warsong Hold.
1x South Nerub'ar Sinkhole Destroyed
1x East Nerub'ar Sinkhole Destroyed
1x West Nerub'ar Sinkhole Destroyed
1x North Nerub'ar Sinkhole Destroyed
North, south, east and west. Those are the locations that you should be concerned about. Surrounding this fortress, within Mighstone Quarry, are four perfectly situated Nerub'ar sinkholes.
<Holgoth hands you a bundle.>
Be very careful with that package, [player]. Mishandle it and you'll be dog meat.
Inside the bundle are seaforium depth charges. Get to each of those Nerub'ar sinkholes and plant a depth charge at their center point. If all goes well, the tunnels will collapse.
Get a move on!