Completing Surface Area

Walkthrough: After defeating a Metroid, you will get some of its DNA. Chozo Seals require DNA in order for the switch in front of them to work. The one in the previous area had one purple orb glowing, which means you only need one piece of DNA to advance. Head back to the tall hallway and start climbing to the very top. Unlock the charged door, and then grab onto the ledge to pull Samus through the passageway. To the right is a door that leads back to the Chozo Seal Room. Stand in front of the Chozo Seal to drain the purple lava in the room.

From here, go down and head through the depths until you reach the door. Open the door to the next room, that same that has a mysterious statue and another button in front of it. You won't be able to do anything with this yet, so continue on the path. You'll certainly need to come back here at another time, but for now, Samus isn't strong enough for this stage. So, destroy the blocks in the bottom-left corner on the room. This will lead you to the Elevator that will take you forward to Area 1.

Missile Expansion: Above the room where you first received the Charge Beam is another room with the expansion inside. In order to access it, you must shoot the weaker spots in the path directly through the taller room.

Energy Tank: After having the Charge Beam, exit the room you received it in with your Morph Ball. Squeeze under the platform to reach the first Energy Tank.