Tower Inside [A7, A8, A9 Sectors] 900~921F, 塔内【A7~A9区画】900~921F?, lit. "tou-uchi [ei-7~ei-9 kukaku] 900~921 efu") is the series of sections of the First Tower of Ar tonelico that go from the Symphonic Reactor to the SPU, pretty much linking the city of Platina to the Rinkernator. It also has two shuttles that lead to Tower Inside A8 Sector 912F.