Phase Drift Search

Walkthrough: After stepping off the elevator to Area 5, you'll see the Chozo Seal on the left that shows you'll need to defeat seven Metroids in this area. Further to the left of that is your first Save Station. Move into the next room and you'll eventually reach even more poisonous clouds. Use your Lightning Armor to make it through, getting to the water on the next floor as quickly as possible. There will be a Teleportation Statue near that, and a Missile Expansion just to the right of the statue.

Continue moving forward into the next room, which will actually have an Alpha Metroid inside. After defeating it, go to the next room just to reach the connecting room to the left of it. From there, roll underneath the red spikes and fall through the floor. It is here you'll find the Phase Drift Aeion Ability. Not too far off from it will be another Super Missile Expansion.

Missile Expansion: At the start of Area 5, look for an initial weak point in the wall just to the right of the teleportation Statue. Follow the path to find the Missile Expansion.

Super Missile Expansion: After obtaining the Phase Drift, roll across the four weak blocks nearby and Bomb the hole on the right of them to find the Super Missile Expansion.