Lightning Armor Search

Walkthrough: After stepping off the elevator, drop to the Save Station. The door to the left has no value to you, so head to the right. Hit the Door you come to with a Charge Beam, and then pass the Chozo Seal that shows you need to defeat eight different Metroids in this Area. In the following room, go up and activate the door. Go back down and leap over the water until you come to the very last platform. Spider Ball up the last wall and crawl through the hole on your right. By wrapping around the T-Shaped Platform, you'll arrive to the new Teleportation Statue. Keep heading in that direction, and you'll come to a room that contains the first Metroid.

After defeating another of the Alpha Metroids, destroy the weak point on the wall with a missile to find the next passageway. Spider Ball across the flora, continuing until you reach the door that needs to be hit with a Charged Beam. In that very room, Samus will learn the Lightning Armor Ability. When activated, this ability will get you through the poisonous flora. After getting it, start moving upward. To the left is the next Missile Expansion, on the right is a path that will lead you to blocks that need destroyed. Look through the slit of the wall and shoot the door to open the door you saw earlier. Start heading back to the exit of this room, heading for the door you just opened to proceed.

Missile Expansion 1: Directly before the first room with the first Metroid, hit the wall with a weak point to the right with a missile. After doing this, the Expansion will be right ahead.

Missile Expansion 2: With your new Lightning Armor, run through the hallway of the flora. It won't be long before you find the second Missile Expansion.

Missile Expansion 3: After obtaining the Lightning Armor, leave the room you obtained it in and head to the wall on the right with the three weak points. Use your Bomb to destroy all of them, crossing the water after you do. At the end of the hallway is poisonous gas, so activate your Lightning Armor to pass through it. Bomb the weak points of the ensuing walls, dropping down to the water below after you do. Here is where the next Expansion is.