This quest is not available in game.
Find Gelkak's First Mate, the Threshwackonator 4100, and lead it back to Gelkak.
Landlubber, ye needs to find me first mate.
Take this'n key, puts it in his gulliver an' bring him back here to serve the Cap'n.
Them murlocs an' their chief ain't gonna be too happy once me first mate gets a hold of em!