Crashed Alien Spaceship Excavation

Publisher's blurb: An excavation has broken into an ancient cavern, with a floor of rusting metal sheets and support beams. Stairs lead down into the belly of a long-buried alien spacecraft. The second level is filled with thick cables covered by metal grids, with strange glyphs carved onto the floor. Small chambers and hallways crisscross the ship’s hull, while at its heart waits a large octagonal room. At its centre is a pale, circular platform. What does it do, and how much of the original technology has survived?