Bury Those Cockroaches!
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.
Be very careful with that package,
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!