From Unofficial QEdit Wiki Guide
ID/Name 403 | 1-3:Subterranean Den Information Nobody has come back from beneath the Central Dome alive... Description Client: Principal Quest: Nobody that we've sent beneath the Central Dome has come back alive. Please go down and investigate. ※ Job can be joined while in progress. Episode I > Normal > Government
Official translation. File originally provided with a default Tethealla implementation.
quest403_e.qst (Official English translation)