Speak to Murd Doc.
The gnomish capital, Gnomeregan, hasn't been under their control for some time now. I know what it feels like to lose a home.
Please, venture inside Gnomeregan and speak to Commando Murd Doc, a member of S.A.F.E. If there's anything at all that you can do to help them take their home, I urge you to do so. There are dark secrets in those halls.