Follow the walkway around the Hephaestus Core in a counter-clockwise direction until you reach the Geothermal Core entrance and head inside. The Geothermal Core entry area is devoid of Splicers so take your time and hit up the Gene Bank and U-Invent machines located here. This is a great time to splice the SportBoost 2 tonic if you have it—that extra speed should come in handy!
Continue to the far end of the area and hack the two Turrets flanking the stairs—you’re going to want them on your side! Atlas radios in with a plan for removing the water flooding the room so you can use the elevator. Collect the items from the storage crate and prepare for battle.
Objective 7: Redirect the Magma FlowIn order to clear the flood, you must crank the Redirect Valve until the interlock is fully engaged. This redirects the magma into the lower levels and should boil off the water. 
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Ryan isn’t going to sit back and let you continue lugging an EMP Bomb towards the harmonic core, so you can bet quite a few Splicers will pour into the room as you crank the valve. Use the Proximity Mines in the storage crate to lay a series of explosive traps at the foot of the stairs on each side of the room. With the mines in place, add a few Trap Bolts for to add a second layer of defense. If done right, you won’t have to worry about the enemies at all.
With the defense perimeter in place, you’re ready to start turning the valve. Approach the valve and continue to turn it until all of the lights on the panel turn green, signaling the full flow of the magma. The magma boils off the water, the elevator comes up, and you can descend to the lower level. Head through the door to the east, pick up the Shorten Alarms 2 tonic and Automatic Hack Tool and continue on to the Hephaestus Core.
Ride the lift up one level and place the EMP Bomb on the Harmonic Core platform. This starts to override the system—not to mention initiate one hell of a security call! Quickly make your way back up to the upper level of the walkway and back to Central Control where the entrance to Ryan’s Office is located. Don’t try to stop and fight, just keep running!
Objective 8: Destroy Ryan’s Mag-LocksYou’ve overloaded the harmonic core powering the mag-locks on the door to Andrew Ryan’s Office. Throw the circuit breaker in front of the door to destroy them with a massive surge of power. 
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Run back to Central Core—making sure not to stop for anything—and throw the Circuit Breaker to overload the mag-locks securing the doors to Ryan’s Office. All sorts of Splicers and Security Bots will be raining hot lead down upon you from all directions, so focus on the task at hand and be ready to use those First Aid Kits you’ve hopefully been stockpiling. It takes a few seconds for the mag-locks to blow open, so sit tight and be ready to run through the door to the bulkhead door as soon as it opens.
