You'll first find yourself in a transfer bay you left sector 1 in. Feel free to explore the room for health and ammo. After that, take a left to see a sign that reads...

Research Facility ?
?SkyTram Research

Access will be denied to the SkyTram research, so continue onward to the Research Facility.

Keep going down the hall 'till you come to the next door, in this room, look to the left and find a sign that says 'gallery'. Go into that room and around the exhibit to find some armor. Go back to the room, take a right to the next room. Go to the left door that reads 'Research Sector A', since the other ways are denied. In here, just explore the many offices in the area. Collect health and ammo, and go to the office in the center. In here you will find a PDA, then start to retrace your steps as you are ambushed by a number of Revenants and Vulgars. Now once you are back in the main room, bring out your artifact to prepare for the bruiser soon to come. When the bruiser spawns, activate the artifact and just simply punch him. Nice and easy. Look to the left at the door with an access panel and a sign reading 'Research Sector B'. Go to the panel and activate the door. Go through the door and down the stairs, now you will find an office with McNeil inside with some activated sentinels keeping the perimeter secured. Walk forward and a cinematic will play, McNeil gives you a briefing on what needs to be done with the artifact. Continue down the halls and through the next closet-like room. Continue to the next room, which will have an airlock inside. Cycle the airlock.

Straight off the bat you will find many Forgottens waiting for you. Take them out with your gravity gun. Continue down the walkway, grabbing the oxygen tank up the way. Take out the two Revenants there, and keep ascending up the stairs. Once at the top level, you will find a door. Scan your access card. You should have it by now, and will grant you access through the door.

In this room, go forward, coming to two stair sets, one up and one down, go to the one leading up, and hit the button on the access panel. Go back and go down the stairs, collect the PDA near the dead body, and go down the walkway, taking out 2 revenants and 2 Vulgars on the way. Go up the stairs, and find a door with a dead marine next to it. And YAY you�re outside again. Sprint down the bridge, ignoring the enemies, rushing to the airlock.

Immediately after the airlock cycling, 2 Vulgars will be waiting for you. Take a left and into the next room. Fight off the enemies waiting for you. Then take a left and into the next room. There will be quite the lot of Z-Secs waiting for you. After the area is secured, there is good news for you fellow A.D.D. guys out there...there is now a new game! Martian Buddy Blaster!

Anyway, Turn around and go into the door with a box in front of it, collect the ammo inside and head back. Take a right down the hallway. 2 Z-Secs will be waiting for you, kill them and head left. A Few more Z-Secs will ambush you, at the end of the hallway, take the PDA there, turn around and into the door at the side of the hall. Collect some health and Ammo in this small room, in the next area, you will find a key-code access panel, and you will hear 'Warning: automated turret guns online' Enter the code '281', and the bridge will lower, hearing 'automated turrets offline.' Head on across the bridge, and kill the various Z-Secs securing the area, now in this room, you will find your handy dandy plasma gun! Go to the access panel in the back of the room, and activate the lift. Now retrace your steps all the way back from the halls, and the room where Martian Buddy Blaster is. In that room, you are gonna encounter quite a few Vulgars and revenants. Go through the door at the 7-o-clock of the game, through the small room, and take aright. This time access will be granted to the lift area, go onto the lift and activate it. Wait a lil' bit, doo doo doo doo doo...manah manah�

Okay there. Go through the room ahead of you, and straight off a cinematic will activate where you encounter... Hell Hunter Shield!

Hell Hunter Shield - By: Fluffy Kitty

HELL HUNTER 3: "SHIELD"
Health: 2700
Attacks: Slash-50; Bolt- 35; Electrical Field- Up to 100
Ability gained: Invulnerability

Oh crap. The other Hell Hunters were pushovers when compared to this guy. This will be the toughest Hell Hunter fight, but that doesn't mean it's impossible, or even all that hard if you are good. I suggest the Chaingun for this guy. First, use your artifact, and pepper him with .30 caliber bullets. Soon he will become invicible, but a shield generator will give you the option to open it up. Open it up, and fire at it until it blows (Preferably with the rocket launcher as we want to conserve Chaingun ammo). Repeat this step another two times, until all the shields are down. Be warned that all his attacks now do 25% more damage. Now, if you need souls, use the fellow up above or the marines in the hidden section below. There is also ammo down there, but you are extremely vulnerable to electrical fields while down there. Use your artifact one more time and fire away with your Chaingun (Or rocket launcher if you managed to run out of chain gun bullets). Once he's dead, you are greatly rewarded for your efforts with the best power of all: Invulnerability!

Now that you have your artifact charged with invulnerability, you should be practically unbeatable! Well now, just turn around and head back to the lift and activate it. doo doo doo doo.....manah manah�

Okay, now head on through the hall, taking out the Revenant waiting for you. Take a left and through the clear glass door. Now you should be in an office. Activate the Panel and collect the PDA sitting on the desk, now you will see a big tough scary bruiser stomping his way down the hall. Head back to where you were, activate the artifact, and kill the two bruisers waiting there. Take a right, killing the revenant in your way, and head on down the hallway, in this room, activate the artifact, and kill the crapload of enemies on there, once they are gone, activate the access panel that reads 'open bay door' and exit to Phobos Labs: Sector 3.