Impact Crater

The Impact Crater is an area of Tallon IV. It was where the meteor that brought the phazon to Tallon IV crahsed. The Impact Crater has a large system of caves under it that none have dared explored, save for one: Samus Aran, who ventured into the Impact Crater to defeat the Metroid Prime. After doing so, the Crater collapsed and was flodded with water.

The crater consists of only twelve rooms, seven of which consist of the Metroid Prime's abode (or at least where Samus fights it). The crater is full of orange phazon, and the only lifeforms which can survive in it are the strange Lumigeks and Fission Metroids. There is one Save Station and one Ammo Station in the Impact Crater, two Crater Tunnels (A and B), the Phazon Core, the Phazon Infusion Chamber, five Subchambers, and the Metroid Prime Lair.

The Crater is elaborately decorated, however, with various mysterious objects, for example, floating platforms in the Phazon Core. It is unknown whether the Chozo put these platforms there, or who. It is also unknown who built the Phazon Infusion Chamber, and its subchambers. Whatever the truth, it went down with the crater.