Speak with Klockmort Spannerspan in Ironforge.
A gnome friend, Klockmort Spannerspan, sent word to me from Ironforge. He tells me he needs help on a dangerous, but essential, mission into Gnomeregan, the once great gnome city now contaminated and filled with mad gnomes and their devices.
I must stay here, but my heart aches to help my friend. If you can go in my stead, then I would be much indebted to you.
You may find Klockmort in Tinkertown, in Ironforge.