The Lost Expedition

The Lost Expedition is a quest obtained by reading Alethius's Notes next to his dead body in the Nchuand-Zel Excavation Site. The easiest way to start this quest is to read the note right after killing the Frostbite Spider Nimhe as a favor to Calcelmo's during the Theive's Guild quest Hard Answers. The note is found right up the stairs from where you fight Nimhe.