The Underground Pass is one of the only ways to get to and from the elf lands of Tirannwn. The only other way is to charter a boat for 1,300GP. Most people just pay 1,300GP rather then go through the pass, as its a long and complex pass, requiring high agility and much patience when you fall.
Related Threadsunderground pass - last post by @ Dec 25, 2006
Underground pass - last post by @ Jul 19, 2006
General Discussion I: Bats In The Underground Pass - last post by @ Nov 3, 2004
Those who have done the "Undeground Pass Quest", PLEASE READ NOW!!!!!! - last post by @ Aug 9, 2006
Underground Passage - last post by @ Jun 19, 2004