Energy Core Access is a room in the Chozo Ruins. It appears in Metroid Prime. It is a short tunnel containing Eyons on both walls, with the stone floor stepped in places. A Morph Ball tunnel covered with a Sandstone blockage is at each end, at ground level, and provides quick and easy passage past the Eyons once the Morph Ball Bombs have been obtained.
- 3 Eyons
- "Structural weakness detected in Sandstone block's core."