There are 2 ways to reach the power generator that powers the nearby keypad. Either you can head to the Northern side of the room and go through the opening in the wall or you can head to the Eastern side of the room and climb up through the opening at the catwalk.
Either way, in this small room, look along the Western wall. You can find a Biocell next to the breaker that allows the keypad to be powered up.
With the power flowing, the ground path is blocked off. The water is electrified and it will heavily damage Jensen.
Head over to the door using the catwalk above you. This lets you safely bypass the electrified water. Drop back down to ground level and go over to the door.
With power restored to the Keypad, you can either hack it or input the code (0451) to gain access and the achievement A Heated Combination
Now, time to use the skills taught in the tutorial. There is also a civilian corpse in the middle of the room. On it you can find some Painkillers. There is a Thug ahead that you need to neutralize. Either you can eliminate him using a Take Down or your guns.
Loot the body and then head over to the doorway and take cover. You can see 2 more in the hallway ahead of you. You either need to wait for the one closer to you to move toward you and then face away. Move in and take him out then.
There is just one more thug at the far end of the hallway. Take them out with a gun or charge in and take him out.
Head to the end of the hallway and look on the right-hand side. You will see a locked door. Either you can hack the keypad or enter the code 4801.
Go inside the room and loot the corpses and lockers to stock up on ammo and some useful items.
Go to the Western side of the room and move the heavy plastic case. Behind it you will find a Structural Weakness. Punch through the wall to gain access to the elevator shaft. Either you can drop down through here or use the call button on the other side nearby where you took down the final Thug in this area.
- Infiltrate the building
- Restore power to the keypad
- Seal off access to the Atrium
- Jam the signal boost (secondary)