Subchamber One is a room in the Impact Crater. The room is accessed from the Phazon Infusion Chamber, and leads to Subchamber Two. Samus enters the room during the battle with the Metroid Prime. The room is significantly smaller than the other subchambers, and has a number of white structures in Samus's side. The other side is taken up by the Metroid Prime. During the battle, the Metroid Prime will destroy these structures, revealing Energy and Ammo. Once the Metroid Prime has taken 25% damage, it will retreat into Subchamber Two, and Samus will follow.
Inhabitants of the Room