Welcome to the inside of the rift worm. From the starting spot, head forward a little way and look to the left of the slanted steel support for collectible (1/2). Regroup with the squad and head down into the ramp, through the water and up the other side. At this point you will see some giant teeth gnashing together in front of you. Wait for them to come down and then run across as its going back up to avoid being crushed. Continue past the second tooth and then sprint across the longer third set of teeth, jump to the right as soon as you can whilst crossing it.
The next area is a little tough, there are a long series of teeth and you must run (hold the ‘A’ button) the entire way through, but do not stop until you reach the end. Whilst you are running you are crouched so if you stop you will stand up and perish. Make sure you avoid the broken walls along the route here if you get caught on them while you are running you will die. When you reach the end follow the rest of the squad to the right.
Follow the passage around the corner until you reach some more teeth. This time, our first challenge is a set of horizontal teeth, much like the vertical variety, the best bet is to wait for them to shut, then run through as they are opening. Traverse the two sets of vertical teeth and exit the room via the last pair of horizontals. Follow this pathway until you see a short cut-scene.
After the cut-scene you will be attacked by a number of small spiders that erupt from the floor. Destroy them all and carry on through the room. After another short cut-scene you will be chased through the area with a giant ball of debris chasing you. You want to avoid touching the glowing grass-like sections of the worm as they will damage you. From the cinematic, run forward hugging the left wall as you go to find collectible (2/2). Then run around the corner and up the ramp. Hang a left at the top and follow the path down to a sphincter. Dom tells you to, 'Concentrate your fire on the opening' So do it! Shoot the sphincter and it will open, allowing you through.
After the sphincter, take the left path and follow it around to the right as the death grass cuts you off. Head to the wall here and look around for a flimsy mucus membrane and use your lancer to chainsaw through it. Follow the path to the left, until you reach another sphincter. Repeat the previous process to open it and head through, run along the set path and when you reach a dead end, listen out for a car alarm. Look up and shoot the teetering car. It will fall down to your level. Use it as a bridge and continue over to the left, follow the path until you reach a dead end. Once again, find the mucus membrane and cut through it to end the chase.
Head up the ramp to the left and stop before the green acid on the floor. Shoot the green piece on the end of the dangling bits to turn them off temporarily. When the acid nozzle is inactive, you need to sprint over the green acid pool on the floor until you are on safe brown ground again. Repeat this process until you reach the big pool of acid at the end, continue along the narrow path around the acid here and then continue up the hill. You will now enter the intestines, this bit is a bit like a maze and is filled with gas, meaning you need to get through it quickly or you will die.
Head forward and continue on through the small gap in front of you, take a left when able and you'll see a tunnel leading farther into the intestines. Follow this to the end and you will come across another mucus membrane, use your lancer to chainsaw your way to safety.
After the cut-scene head up the slope and follow the path until you reach another mucus membrane, lancer it again and head through to find a heart. Use the chainsaw to sever the artery and the vein attached to the heart and a passage will open. Exit through here, then climb up the ramp and carry on along this path. You will be attacked twice by the little spider enemies we encountered earlier, they are easy so just exterminate them and keep on going until you reach another membrane. In this room is another heart. Head over to the left side of it and cut the arteries and veins as you head up the ramp. There should be three. When you are done another passage should open for you.
Proceed along this path until you reach one final membrane. Cut it and head inside. As you enter, you will be attacked by some of the little spiders again, kill them and head to the far end of the chamber. Here is the heart. You will have to cut four blood vessels this time, two on the left and two on the right. As you approach the heart and as you cut the arteries, you will be attacked by the spiders, ignore them as best you can and focus on the blood vessels. Kill them all and you will complete Act 2.
