Underwater Facility
July 1, 2013 / Chinese Waters
Head forward and open the partner required double door to release Jake and Sherry from lockdown and set off the alarm. There is a small vent in the room to the left of the control panel that you need to crawl under to reach a new area. Break the crates and toss Piers across the gap.
Underwater Facility: As Chris
- Turn around and jump down the ladder to head down and through the first fan on your back. You should see a Serpent Emblem straight ahead on top of a pipe.
- Check the area for crates and head to the next fan to signal Piers to shut it down.
- Crawl through and slide down the tunnel to a room with two J'avo and an elevator that you can ride up to collect Piers. You can check his floor for some crates as well.
Underwater Facility: As Piers
- Head to the far side of the area and pull the lever to stop the second fan first, that way you don't have to pull the second one mid battle.
- Break open all the crates in the room and then pull the lever directly across from the gap.
- J'avo will flood into the area and man the turrets and walkways as they snipe you. Focus on taking out the snipers and RPG J'avo first and then snipe the J'avo on the turrets. When Chris turns on the elevator, you can clear out the area or head straight for the elevator and head downstairs.
Ride the elevator back down and open the double doors to a room which seems to have an endless stream of enemies coming through the far door. Kill the J'avo as they enter the room, usually in pairs, and when the stream stops head back to where you entered and look up the the right for a Serpent Emblem. Go through the door to bust open any crates and get the 40mm Acid Rounds and 40mm Nitrogen Rounds from the chest in the far left corner.
The next room has an RPG toting J'avo and two other J'avo waiting to ambush you. Be careful as you advance inside and for some crates and then power up the elevator and take it up.
The next room is a prime ambush location that you should scout for familiarity and crates. Once you are ready, head for the partner required button and prepare for the ambush. There are many ways to handle this battle, but I find that staying high and safe from enemies is key. Take either ladder to the upper level, kill the snipers and outlast the timer. When the door connects and depressurizes, head back to the door and proceed through.
Underwater Facility - Lower Levels
Head for the central panel to activate the two lifts and then check the area for crates. Depending on which lever you pull will determine who your ride the lift with and what dialog you hear as you ride up (Jake and Chris have some interesting dialog).
As the lifts take their long and convoluted path up, watch your back from J'avo dropping down onto the platform. When you reach the top the chrystalis will pop and Haos will be revealed.
Underwater Facility - Upper Levels
Climb the ladder behind you and immediately be prepared to dash away from Haos as he destroys the walkways. You will need to keep running over obstacles until you get to a high ledge where you'll need to boost/get boosted up with O/B and then press it again to assist Chris up as well. If you are Chris, do not be surprised if the AI gets dumb and does not grab you in time.
When Haos blocks your path with his arm, shoot him in the head to free yourself and continue to dash down the path. When you reach the pipe with a gap under it, slide under and continue again to the next partner required ledge. Jump off the far side and when Haos blocks your path shoot his head again.
The next partner ledge will automatically fail by not allowing Chris to reach it. Instead, Haos will pick it up and toss the platform around while Chris must tap X/A to stay onboard and Piers shoots Haos. Once Chris is safely on the walkway again, head for the elevator and rise it to the upper level.
Boss: Haos
Move around the outskirts of the area as Haos rotates to try to get a straight shot at your characters. There are many crates on the outskirts of the area, so grab them when you can as you continue to move and stay out of Haos' reach.
Nitrogen Rounds help to slow down the creature and allow you to release a barrage of shots on him before he tries to attack. Continue moving and you should have no problem taking him down after a period of time.
Emergency Escape Route
Start by grabbing the 12-Gauge Shells and 40mm Acid Rounds from the ground before you equip a decent weapon, such as the Shotgun, and head forward.
Haos will attack the structure and cause it to be flooded, initializing the buildings safety bulkheads and breaking it off from the main shaft. Start by using the L stick and pressing X/A to use your stamina to climb the walkway and get under the first door.
After that you need to run through the area, shooting Haos' arm if it blocks your path, and slide under the doors before you get trapped.
When you reach the end Piers or Chris falls and you will need to rapidly press X/A to hold the door up for your partner. Once both characters are safely on the other side, turn around and shoot the Serpent Emblem on the floor. When you're ready head through the double doors and prepare for round two.
This time you are running away from Haos. Turn left and slide under the door, where the camera will change, and then keep dashing as you run through bulkheads with Haos in pursuit.
Boss: Haos - Cont.
The battle starts with Chris captured and Piers badly injured. If you are playing as Chris, enjoy the downtime. If you are playing as Piers, crawl to the C-virus needle and inject yourself and release Chris with your super charged attack (Hold L1/LT and R1/RT to charge your attack and let go).
With Haos' in a chrystalis, check the area for crates and stock up on ammo for the battle to come. When you're ready, head for the door to depressuize the room and release Haos.
This battle can be extremely hard if you have no health and do not use your ammo correctly. Start by looking for the two glowing bulbs on either side of Haos' body. These are your targets and they will explode after taking enough damage, but shooting them without dying can be tricky. Start by running away from Haos to get behind a container and out of his reach.
There are two "forms" that change Haos' attacks:
Form 1 (On top of the containers):
- Shoots liquid at the player that can not only cause damage on impact, but also explodes
- Hops down onto the player to inflict damage
Form 2 (On the Ground):
- Thrust a tentacle at the player to grab and draw them close
- Pick the player up and break his back if he gets too close
- Summons tentacles that spread out from its location and can not be avoiding by ducking or lying down.
Fight as Chris
The best strategy is to stay behind the containers and use them as cover when Haos is on the ground and shoot him from a distance when he is on top of them.
When you manage to destroy both bulbs, Haos' body will convulse and he will enter chrystalis form again. Instead of letting him get out, shoot an Explosive Round/Hand Grenade into it and break the shell and then rush in to stab it in the heart with R1/RT. Do that a couple more times and you will defeat him.
Note that you can't shoot the shell right away, as the shell won't break and you'll waste your ammo. You should also know that weak weapons will not pop the shell before he is renewed. It is best to save at least 10 Explosive Rounds just for popping the chrystalis and if you run out, the next best option is the Sniper Rifle and hope that your partner does their job in helping.
| Piers is the chrystalis breaker, as chrystalis are weak to lightning. If you are playing Chris, hold O/B and tell Piers to "Move In". |
When you stab him the final time, Haos will knock Chris back and put him in dying state while Piers holds him at bay. Crawl toward Piers and press O/B and the rotate the L stick to finish the bastard off.
Fight as Piers
Piers has only one type of attack, his lightning arm. The longer you hold L1/LT and R1/RT, the stronger the attack. The issue is that Piers is locked in his positions and Haos might move or attack.
Focus on small attacks by simply tapping L1/LT and keeping out of range of Haos' attacks. When Haos enters his chrystalis, charge your attack to max and break the shell. You can then rush in and stab Haos with R1/RT.
When you stab him the final time, Haos will konck Chris back and put him in dying state while Piers holds him at bay with X/A. Keep tapping repeatedly until Chris makes his way over and stabs Haos.
The Final Escape
After the battle is over, head back to the pressure lock and open the door.
The building is collapsing around you and sticky membranes block the path. If you are Chris, there is nothing you can do but watch and run forward. If you are Piers, use your charged attack to destroy the membranes and allow your partner through.
There are three membranes in total, but the last one is special. If you are playing as Chris, instead of helplessly waiting on Piers, take out your handgun and move to the right side of the platform and look down to the right, above a light, to shoot a Serpent Emblem before you continue and finish the level.
| It is possible to hit the Serpent Emblem with Piers' lowest attack, but it is hard. It is easiest to get as Chris. |
Trophy/Acheivement - Duty Calls
| Rank | Accuracy % | Deaths | Clear Time (mins) | Enemies Routed |
| A | 70 | 3 | 80 | 40 |
| B | 60 | 5 | 110 | 30 |
| C | 50 | 9 | 120 | 25 |
| D | 49 or below | 10+ | 121+ | 24 or below |


