This quest was marked obsolete by Blizzard and cannot be obtained or completed.
Pilot Hammerfoot at the South Gate Outpost wants you to find Pilot Hildelve.
My friend and fellow Siege Engine pilot, Mori Hildelve, is lost in the hills. We were looking for a rare ore that's needed for a high-grade blastpowder, and during our search he drove his engine up a steep hill and busted it!
Still convinced that ore was in these mountains, Hildelve charged me to guard our engines while he continued on foot.
It's been days, and I've heard some beastly growls north of Helm's Bed Lake, west of the tunnel. Mori's tough as nails, but I'm worried.
Here is the corpse of a dwarf -- mauled, frozen, and picked clean by mountain scavengers. Clutched in its hand is a book containing the roughly scribbled notes of Mori Hildelve. And around its frame, still in superior condition, is a Brigadier's Vest.
This grisly scene must have been where the Siege Engine pilot met his end.