So, you have escaped from Glathriel Village in one piece. Now, you know that the object of your search is near. Pursuing your quest, you emerge in a small tract of land.
You start in the cave via which you left Glathriel Village. In a tunnel entrance ahead, a Gasbag sights you and attacks. Kill it. When it is dead, go towards the tunnel entrance and enter the tunnel, making a diversion to collect the Nali Healing Fruit on the right if you need to. Follow the tunnel's curvature round to the left. You will shortly emerge in a small tract of land. You are on a dirt path with a section of ground raised on your left.
Follow the dirt path. It slopes up to meet the level of the raised grassy area. The raised grassy area has a fence and a few plants but nothing of great interest. Watch out as you near the raised level, because you can expect to be spotted by some of a group of four Pack Hunters that patrol this level. Kill them as you proceed through the area - I recommend the CAR.
Beyond the raised grassy area, the valley continues past a large rock on the left. Follow it through - there's a Nali Healing Fruit beyond the rock if you need it - and you will come out shortly in the middle of a cluster of three Nali huts. If you're in the mood for looking around, you can go round to the right of the rightermost hut. Passing a Nali Healing Fruit, a barrier will open and you will be in a Nali Cow pen. There's nothing of interest in there though.
Visit the huts one by one. I'll start with the one on the right. This hut contains a Nali praying by his fire. Raid barrels for two clusters of 40 Tarydium Shards, then read the Nali's diary on the table.
Another thunderbird has fallen from the sky, right before our eyes! I am very scared. Scared that the Skydemons will come to our valley now.
Leave and cross the settlement to the hut opposite. Barrels outside reveal a Nali Fruit Seed. Going in, you will find a Nali and a barrel containing a Flare. Go then to the third and final house, the one at the end. You will find another Nali, two Bandages on the table and wooden crates that reveal a Clip. When you're done, leave the house and go to the right where there is a UMS drop box generously supplied with two 50 bullet CAR Clips and a Combat Assault Rifle.
Whilst in this area, take a moment to go towards a gap in the cliffs where there is a fence with a break in it. You will realise then that you are looking out over a huge valley that contains your goal - the hulk of the UMS Prometheus.
It's a long way down into the valley, so don't jump off the cliff or you'll be smashed on the ground below. You'll see a UMS drop box on the floor of the valley but you can't get to it. Instead, return to the houses and make a left. You'll come to another fence with a gap in it, where you can collect a Nali Healing Fruit on the right if you need it.
Go through the gap in the fence and follow the valley on downwards. Shortly it ends in another tunnel entrance. Go into the tunnel and follow it down to the large cave beyond. Within the cave, you will see a ravine blocking your path with a precarious wooden bridge crossing it to the left. As you enter, two Gasbags will descend from the roof of the cave, causing a Nali on the far side of the bridge to run across it in a panic. The bridge collapses under the Nali's weight.
First things first, kill the Gasbags. Then, raid wooden crates on the left on this side of the ravine for two clusters of 40 Tarydium Shards. Now comes the tricky part - you may want to save your game first. Go on to the raised section of earth that the bridge crossed from. Take a good run up and try to jump across the ravine - if you fall short then you'll be squashed on the floor of the ravine.
Once safely on the other side, take a look at the first tunnel entrance on the left and you will see that it is blocked by a large boulder. Open a barrel here for a Stinger. Then, go to the right and down a short drop on to a lower level. There's another tunnel entrance there, but first destroy wooden crates beyond for a Nali Fruit Seed. Take the tunnel entrance and follow it through until you come out in a mine cave. Watch out as you enter for four Spiders that attack from various corners.
Look around. To the left is a high-tech outcrop of Skaarj mine architecture. Ahead is an old Nali mine working.
Go down the old Nali mine working first. It comes to a dead end at a rock fall, but you can open barrels there for 40 Tarydium Shards and a Nali Fruit Seed. Return to the main mine cave.
Approach the high-tech entrance now (to the right as you return to the cave). There, you will see a Shield Belt on some large boxes. To get to it, locate a small metal crate and push it to the boxes, then use it as a step. When you've got the belt, go into the high-tech entrance and ride the lift within up to exit the level.