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Down and Out
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So you've fallen down into another cave. Some elite soldier you are. But you do
have a flamethrower. If you remember the flares from the previous level you are
already one step ahead of the game here. The scorpions hate fire, it scares the
beejezus out of them and sends them skittering all over the place. With the
flamethrower in hand you can kill scorpions easily and scare them as well. Just
be sure to reload when none of them are around. When fighting them try to use
the flames to scare them away and then run for it, it's more efficient not to
try and fight every last one of them.

The only way to navigate this place is using the walls, keep one of the walls
near you at all times. By this I mean make sure that you pick either the right
or left walls and stick to it. Don't mvoe between them or you might get turned
around.

Now move to the right hand wall and stick to it. When you come across the pair
of scorpions start hitting them with the fire and try to push them towards the
third one that's trying to come up on you. Take out the three of them or just
scare them enough to allow you past and run for it. Reload as you hop between
the ledges and you will reach a bridge. Sprint for it and then jump across the
gap that appears in the middle of it.

Now up ahead you should see a wall you cannot pass but there's a peculiar jet
of steam it looks like that rises up in the middle of the wall. Stand back just
a bit and fire your flamethrower at the wall when you hear the hiss of air. The
whole wall will blow up and allow you to progress. Now take the left path and
stay that way, you should pick up some ammo.

Now continue along your path, things get fairly linear from here. Just stick to
your wall and you will be fine. You will have to blow your way through two more
barricades so do so and keep going. A trio of scorpions will attack as you pass
the final one, either avoid them or use the vent to cause an explosion to kill
them. Then keep on moving until you reach a fork in the road. Take the right
path to reach some much needed ammo and then double back and take the passage
to your far left, it's a drop down.

Hop down and keep on moving. When the tunnels star collapsing in don't worry
about it, just wait it out and then move forward. Duck down to pass through the
low passage and you will reach a vertical drop. Don't hop down into the middle
straight off the bat, you must use the narrow ledges around the room to make
your way down to the bottom here. It follows a mostly clockwise spiral until
you get near the bottom so just move carefully.

Once you reach the bottom-most ledge hop off and start heading forward. Duck
down to get through the narrow passage and keep on moving. Drop down when you
reach the next ledge and you will be in a large cavernous area. You know what
that means, right? Boss fight!

As you try to cross the bridge you will be attacked by a sea monster, yay!

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Boss: Sea Monster
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This guy is a bit of a pain but he isn't all that bad once you get the groove
of the fight. Don't be surprised if you die here, just come back armed with a
bit more knowledge of his patterns and handle him.

Take note of the three vents on the floors, they're the same as the ones you
were using to blow up the barricades, see where this is going? You must lure
the creature over the vent and then blow it up with a fireball. Now remember
that these vents do not explode immediately, it takes a few moments to explode
when you fire at it. 

Also, only one of them is lit at any given moment so try to stay near the one 
that is lit. It will start with the right one, then the middle, then the left, 
then the middle and back to the right before repeating. They only change when 
you blow one up with the flamethrower so standing your ground works just fine 
here and is suggested.

To start with the creature will rear back and take bites at you. What you must
do is wait for it to rear its head back and as it comes towards you blow up the
vent. This will cause the fireball to catch the creature in the face and hurt
it. It might take some time to get used to the exact timing but with a bit of
practice, and some luck, you should get it in no time.

Once you hurt him move to the next vent and wait. He will either try to take a
bite out of you or he will splash underwater, he seems to go underwater a good
90% of the time. If he goes underwater he will come up with his tentacles up
and attempt to swipe at you, simply jump before you are hit to dodge this. If
you see his front tentacles are lower than the rear ones he is going to throw
rocks at you instead of attacking you. These are a bit of a pain to dodge but
if you watch the rock you will see what direction its going in. So if it seems
to have a spin to the left, roll right.

After you have ignited the second vent on him he will stop throwing rocks and
using the sweep and begin flinging the stalactites at you. He throws these in
a pair and you can either dodge them by stepping between them or just rolling
in one direction to evade the one closest to you. Regardless of how you do it
this stage isn't too hard to handle so long as you don't get hit twice in a row
by these. If you do, you're dead simple as that. Just wait him out and then use
the third vent on him to take him out.

Once it's dead continue forward, using its body as part of the bridge, and get
towards the next caverns. Take a right at the first fork and keep on moving.
You will soon hit a checkpoint, grab up the flamethrower from the floor here
and keep it at the ready. You are going to have to fight off a tremendously big
horde of scorpions as you move through the caverns ahead. I heavily suggest
that you hunker down near one of the vents and, if the AI doesn't crap out,
Slade will be with you and can help you. Once you've wiped out the scorpions go
ahead forward.

Soon you will see a scorpion mauling a soldier, let it kill him and then kill
it off. Grab the pulse rifle and drop your flamethrower. Go up the ladder and
use your knife on one of the guys here and then kill the other. Now drop down
off this ledge here towards the enemies. You will now be in a scorpion infested
pit but you don't want to stay here. Run for the ladder and go on up it, using
the flares from the shotgun to keep the scorpions at bay.

Get up on the ledge and take out all the enemies you immediately see, notably
the guy on the turret to your right. Once they're dead a near endless stream of
enemies will begin pouring in, use the boxes here as cover and take them out.
Now look up and to your left, kill the sniper. Hop across the pits and proceed
forward, up the ladders you find to finally end this level.