Storage Cavern A is a small dead-end room in the Temple Grounds. It appears in Metroid Prime 2: Echoes. The only item of interest in the room is the body of D-Isl. The Dark Aether version of this room is the Ing Reliquary, which features D-Isl's Sky Temple Key in the clutches of a Flying Ing Cache.
- D-Isl's Testament
- "It is inside me. I feel it spreading, clawing at my will, tearing at my thoughts. It moves me against my will, to this cavern. Here it will end. I do not wish this, do not want my body to become a weapon for the Ing within me. It hates. It demands obedience. I will fight to the end. I shall self-terminate before I will be a pawn of a filthy Ing."