Chozo Ruins

First off, you'll see a wall on your right. Shoot right through it and head through the door that's just beyond.

Once you're through, drop into the water. Take out the fish swimming around you, then look for a block on your left that seems a bit out of place. Shoot it.

Now, use your bombs to blast through the rock to your left. Kill another fish that pops up, then get ready to do some wall-scanning. Shoot all over the left wall – you should uncover a Missile Tank. Grab it!

Head back to the surface of the water and jump back to the dry land where you started. From there, jump to the platform nearby, then to the next one, and then jump left to another platform.

As you jump left towards another platform, use a bomb on the blocks. This will let you reach an alcove. Jump onto the platform inside, and shoot the rocks above you to clear them out. Now, roll left through the passage and jump up to the next room.

In this new room, use your bombs to tunnel your way to the right. Before you go through the door, look below. Set a bomb above the tunnel directly beneath you to drop down into it. Then, head through the door.

You'll see some missiles here, but ignore them for now. Instead, go up to the statue ahead and grab the Unknown Item. The game will tell you, "Analysis inconclusive. Item incompatible with current suit." This is actually the Plasma Beam, but you won't be able to use it until much later.

Roll into the statue's hands. This is a nice little rest stop that restores your health and weapons. Now, head left. You'll need to shoot away some large blocks. Bomb the area just to the left of the block that's covering some missiles. Clear that block and grab the missiles.

Jump out of the water and go back through the door to your left.

Roll left until you hit the wall. Plant a few bombs to break through and continue left a bit. Wait for the blocks to reappear, then roll yourself under the large block and use a bomb to destroy it. Jump up the series of platforms on your left and enter the door located in the mouth of a large bird statue.

As you head left, the ground will give way, and you'll fall down a pit. Once you land, bomb the left wall and some blocks inside it to roll left into the next room.

This room doesn't have much going on, but you'll find the Power Grip in an interesting-looking statue. The game will tell you, "Grab and hang from ledges and corners." This is super useful for reaching new areas!