Metroid Prime 2: Echoes/Gravity Boost

Torvus Bog
The next upgrade takes you to an underwater section of Torvus. The upgrade is used underwater, but since there aren't really any underwater areas outside Torvus, it's not as useful as you might hope.

Torvus Temple
Get to the lower part of Torvus Temple, and go through the Morph Ball tunnel opposite the Temple Access door. Blast open the Green door on the other side. You could have done this any time after getting the Super Missile but it was a dead end until now.

Underground Transport
Scan the control panel to activate the lift, and take it to the lower level.

Hydrodynamo Station
This is a large round room with a ledge around the middle and a deep pool in the center. Get a scan of the floating soccerball like creatures, they are called Preed and are this game's equivalent of Puffers, though in fact they are Space Pirate drones. Before diving into the water, hop up the platforms to the top of the central pillar and blast open the Missile door near the ceiling. If you fall in, locate the doors into the central pillar near the bottom to be fired to the top.

Save Station B
This is the only save station in this part of Torvus, so you'll want to return here fairly often.

Hydrodynamo Station (cont.)
Jump into the water and get to the lower ledge around the central pillar. If you fall to the very bottom then switch to Morph Ball and ride a current that flow up the outer wall to get to the next level up. Scan the large swimming creatures here. They're Bloggs and they appear often down here in several forms. The only time you can hurt them is when they're swimming straight at you with their jaws open, so it takes a bit of nerve to get a shot in.

Locate the scannable pillar on one of the side ledges on this level. Get around behind it and scan it to release one of the three locks attached to the central ledge. Get back to the center and use the Orb Cannon to fire yourself back to the top. As long as you're up here you might want to get a quick save in.

At some point, either by restoring from a save or by leaving the area and coming back, the original Bloggs in this room will be replaced by their immature cousins, Blogglings. Get a scan when they appear; they're smaller than Bloggs and vulnerable to attack all the time instead of just when their mouths are open.

Drop into the water again, but this time only go to the ledge surrounding the central pillar about half-way down. When you released the first lock, a partial bridge was extend allowing you to reach the Purple door at this level. Grab the Missile Expansion here, then blast open the door. If you've been keeping track of your expansions and have suddenly noticed that you have 5 more missiles than you should have, remember that the Seeker Missile gives more missiles. This is where you would get stuck if you came here before getting the Seeker Missile.

Training Access
Follow the tunnel. About half-way through a sparkling ball of light zips pasts you.

Training Chamber
As you enter, the ball of light turns into Dark Samus, who chuckles mockingly at you and disappears again.

If you check the map you can see that this is one of three rooms connected by a ring of tunnels surrounding the main station in the center. The room itself is filled with water and there are Bloggs swimming around. Jump in and defeat them to activate a Spinner at the bottom of the pool. Note that once you jump you're committed since there's no way to get back to the entrance.

The Spinner control the position of a Morph Ball track in the floor, with positions to start left and go right (red) or start right and go left (blue). Whichever one you pick, you'll be coming back to do the other later. The one going left, through the White door, is harder and we recommend doing that one first; the reasons for this will be explained later.

So keep spinning the Spinner until the path lights up blue, then drop into the blue hole on the right and follow the path left.

Transit Tunnel West
Switch to Morph Ball and let the current push you into the Orb Cannon; this shoots you into an underwater maze. You need to drop bombs to break through a barrier and reach a Bomb Slot, and when you activate it the flow of water changes allowing to to get the rest of the way through the maze. A second cannon takes you to the end.

Gathering Hall
This is another water filled room. What you need to do is get to the White door above you and to the the left so you can get back to the Hydrodynamo Station and release another lock. That's going to take a bit of doing though.

First, drop into the water and defeat the Blogg there so you can work in peace. Locate the two platforms with purple crystals underneath them. Shoot the crystals with the Dark beam to flip the platforms; with the spikey side down you can use the platforms as stepping stones. While you're down here, get a scan of the hologram on one of the walls.

Get back out of the water by hopping on the series of ledges near where you came in. Now use the stepping stones to get to the far side of the room and use the Bomb Slot. This opens a gate to a portal under the water. Jump back in and use the portal.

Crypt (Dark side)
Defeat the Dark Troopers here, then locate the Spinner on a platform above the pool. Note that, although there is less water in this version of the room, it's poisonous. Use the Spinner to move the laser to the right; this moves the corresponding laser on the Light side. There's nothing else to do here for now, so use the portal to get back.

Gathering Hall (cont.)
The laser is now pointing at a statue on the wall, which is somehow using the energy to extend a ledge over the water. Defeat the Blogg, activate the crystals and get to the Bomb Slot as before. This time hop to the new ledge on the left, and from there is the Orb Cannon and fire yourself, finally, to the ledge with the White door.

Gathering Access
Follow the passage. There are only a couple Preeds standing (floating?) in your way,

Hydrodynamo Station (cont.)
That whole side trip through the Gathering Hall and the Dark side was to reach the platform that you're on now so you can scan the pillar there. So whatever you do, don't leave the ledge until you get the scan unless you want to to the whole thing over again. Scanning the pillar releases the second lock. Before going on to the next lock, you'll probably want to get back to the save station and save your progress.

The reason, and this is also the reason you should do the hard part first, is the game pulls a bit of a troll move on you when you release the third lock. The ledges on the central pillar move so you can no long reach the Orb Cannon which allows you to get out of the water. That means you can't save your progress between now and defeating the next boss. And so if you do happen to lose the boss battle, you have to do at least one of side trips over. Not that the battle is especially difficult, but it you are going to have to redo a side trip it might as well be just one, and the easier one at that.