Sector 3 / Pyrosphere(セクター3 ·パイロスフィアSekutā 3 · Pairosufia), is the extreme heated, Lava-filled area of the BOTTLE SHIP. It mainly consists of caverns with rocky ground suspended over lava, with an experimental simulated desert area filled with sand deeper inside the sector. The organisms inhabiting this area are mostly from Zebes' Norfair, along with several previously un-recorded lava-inhabiting species.