Once inside the Bio Lab, you'll find a bunch of guards. There will be two floors. Head for the upper level. There will be four guards up here. There are two by the wall that don't move and two moving around. One walks along the long section and the other walks in a triangular pattern on the other section. Wait for the one walking in a straight line to walk as far as he can from the other guards. Take him out, then take out the next closest guard. Head down further and wait for the other patrolling guard to turn his back so you can get the last guard against the wall. Now get the last guard up here.
crawl over the lower section. Just under the upper level will be a single guard. In front of him will be two more guards and to the right of them will be two more. Hit the individual guard first. Then you can hit either group of two. Take the last group and then head down to the floor. There's a small square room here, go inside that.
Use the computer in this room and head to the left to grab the Magazine. In the corner by where you came into this room will be an Audio Log on the floor. Go back into the main room and then head into the newly opened door. In this room with the double helix is another Magazine. Go through the next door and you'll enter a room with giant locks going from the floor to the ground. Go to the far side of the room and stand on the glass beam above the terminal. There's a Metal Box on it. Drop down and activate the terminal. This will open four of the five doors in the room but it will also activate five turrets above the doors as well.
From the terminal, head for the first door on the right and take out the turret.. Go up to the doorway but NOT through it. Web Rush through it and up to the underside of the upper level. Climb up to the ceiling of the room. There will be a guard on the upper level. Take him out with a stealth Takedown. By the glass will be a destroyable object. Destroy it and then grab the Magazine in the corner to the left. Once the object is destroyed, find the vent against the far wall. Go through it. DO NOT attempt to take out all the enemies in the lower level of the room.
In the vent will be a Magazine on the right side. Follow the vent into the next room on the right side. This will leave you on the top floor. Hop up to the ceiling and take out the guard on this level. Destroy this object just as you did the last one. From the upper level, do a Web Rush through the doorway into the center room. Now we are going to do the same thing on the left side of the room.
Go through the first door on the left side and immediately go up to the top of the room. Take out the guard, destroy the object there and find the vent on the far wall. There's also a Metal Box in this vent as well. The vent will lead to the last room. Take out the guard and destroy the object. Leave through the door at the bottom to the middle room again.
A large structure will raise out of the middle of the room with one side open. Find it (near the front of the room) to get in. Walk inside and then immediately get on one of the walls. There are four destroyable objects, one in each corner of the room. If you set foot on the floor, the floor will electrify. You have a moment between when you step on the floor and when it electrifies. During this moment, you need to destroy the objects. You should have enough time each time you get down to destroy one of the objects. As soon as you do, Web Retreat to the walls. Do this until all four are destroyed and a section of wall moves away to reveal an exit.
Just through the hole and when you land, you'll be in a rather empty room. Follow it until you come to a long hallway with a patrolling guard with a machine gun. Follow him along the hallway, taking out the pairs of guards as he passes them. Then take him out. At the end of the hallway will be a single open door. Go through it.
You'll come to a room with blue and yellow panels on the walls. Drop down and you'll get into a fight with five guards with shields. There are a couple of propane tanks in the room so make use of them. If you use them, this fight will go quickly. Go into the room that they were in and grab the Metal Box in the corner. There will be a hole in the ground which is covered by a laser field. However, one of the lasers is off and allows you to get down.
When you go down, look to one end of the hallway and you should see a wall and an object up against it. up against it. There are also two guards next to it. Get behind them and take them out with stealth. Destroy the object and then head for the far end of the hallway. There will be a hole in the ceiling that you can climb out through. Web Rush to the ceiling beyond.
In this room, there will be a few guards by the wall closest to you. Take them out and then head for that far side of the room. There's another object here with two guards in front of it. Take them out with a stealth takedown. There will be four more guards, two on each side of the hall. Take down two with a stealth takedown and then beat the other two. Destroy the object and head back into the main room. Go through the door way and activate the terminal beyond.
You'll be in a lab with a bunch of turrets now. Destroy the two turrets in this room and grab the Magazine on the lower platform. Head across the laser fields and destroy the turrets there. Grab the Metal Box on the floor in this center room. Do the same with the next laser field and the next set of turrets. There will be a fan here. Stick it up with your Web Shooters and then Web Rush through. Destroy the two turrets here and go through the door to leave.
You'll go through a hallway and enter another electrified room. This time, there will be turrets on the walls that appear as you destroy objects. They really don't pose a threat as long as you deal with them first and you should be able to take out two while the floor is electrified.
When you leave this room, you'll find the scientists and be standing in a large ring around their center room. There will be lasers on some of the floors, turrets on many of the walls and guards patrolling. Just take the hallway a little at a time. Hit the ceiling and just keep crawling. Take out the guards as you get the chance and move to the back of the ring. You'll find four guards staring at each other. Take the four of them out and you should see a terminal up against the wall leading to the center room. Use it to open the door and get inside.
Inside the room will be a rather nasty fight with a large group of sentries (which come back for a little bit). The all have shields so you'll have to strip them of their shields before you can attack them. The most important thing to do is watch for your Spidey Sense. You really need to be ready to hit that every chance you get. If you take too much damage, Web Retreat to the walls and Web Rush around the room until you've healed. You will never survive this room if you aren't careful above all else. The worst part is that if you lose, you'll have to start at the beginning of the outer ring room.
After you've destroyed all the sentries, watch the cutscene. Go behind the hunter and through the door. Go through the hole in the wall and start climbing upward. Keep your eyes peeled for holes in the walls that look about Hunter sized. This is going to lead you in the correct direction. Keep going up and following these holes until you find Gwen.
Scorpion
When you get out, you'll be called upon to fight Scorpion outside at the docks. Head on down and start the fight. This fight is very similar to the other though he has a few new tricks. He's much more aggressive with his stronger attacks like his acid spray. Every so often, he will head out onto the wooden pillars in the water. When he does, he'll shoot acid at you. Start by swinging up and holding both triggers to ascend while swinging. After a couple of seconds, head the other direction, then release so you descend while swinging. The goal is to make a circle shape.
After you exhausts himself from his acid spewing, hit him with a Web Rush to deal damage. After that, continue to fight him as you did before until you beat him.
*Achievement: Pest Control
