Frozen Crashed Spaceship

Publisher's blurb: An ancient ice cavern reveals a floor of frozen metal sheets and support beams, with stairs leading into the belly of an alien spacecraft. Down there, strange glyphs are engraved into the floor of the ship. Nearby, broken metal grids cover large cables which flow like rivers beneath the floor. There is a central octagonal chamber surrounded by eight metal pillars, and smaller chambers throughout the spaceship. Narrow maintenance hallways connect many of them, though most end in rubble. How long has the ship been here, and is any of its technology still active?