From Unofficial QEdit Wiki Guide
ID/Name 407 | 2-4:Waterway Shadow Information Mysterious "thing" seen in the underground waterway. Description Client: Principal Quest: Make your way to the underground waterway in the caverns. ※ Job can be joined while in progress. Episode I > Normal > Government
Official translation. File originally provided with a default Tethealla implementation.
quest407_e.qst (Official English translation)