Get to Computer Core Access

You need to print out The Thinker’s machine code so Porter can return with it to the surface. Head to Computer Core Access.

Little Sister Encounter

A Lancer and his Little Sister are likely to appear in the main room outside Wahl’s office as you exit with the signal beacon. You may also encounter a Fiery Brute Splicer and several other Splicers too. Use the Turret and Security Cameras to your advantage by splashing the Big Daddy with Security Command and unleashing Insect Swarm 2 on the Splicers. Set the Lancer on fire with Thermal Cells, then switch to the Shotgun, load the Solid Slug ammo, and aim for its head! Stick close to the upper walkway near Wahl’s office door and strafe behind the wall and windows if you happen to get blinded by the Lancer’s Ion Flash attack.

Gather #1: Data Processing

The Gather Corpse is in the server room at Data Processing and is worth stopping at after claiming the ammo and other valuables from the locked office upstairs. Summon a pair of Security Bots and place a ring of Trap Rivets around the corpse. Ready your Hypnotize 2 Plasmid for the first Houdini Splicer you see, then switch to Insect Swarm 2 or Gravity Well 3. Load the Machine Gun with Anti-Personnel Rounds and keep it trained on the door so you can cut down any Fiery Brute Splicers that appear. Now that you have all of the weaponry and most of the Plasmids, it should be getting easier to protect your Little Sister.

Gather #2: System Programming

The next Gather Corpse is located in the Programming area where you found the Hardy Machines tonic earlier. There are two entrances to this room, but with a Security Camera in the hallway outside and two Security Bots by your side, it’s unlikely that many Splicers will even get inside. Set up some Trap Rivets near the doors just in case and ready the Security Command Plasmid and Rivet Gun for any Splicers that get too close. Hang out by the Little Sister and let your defenses work their magic.

Return to the main Operations lobby and use your wealth of ADAM to purchase the Deadly Machines and Medical Expert tonics, Gene Tonic Slots to accommodate them, and either Insect Swarm 3 or a pair of Health and EVE Upgrades. Continue east to Core Access.

The door to Core Access is burst open by an Alpha Series Big Daddy. Hit it with Insect Swarm, then stand back and allow your Security Bots to aid you in further damage. Continue through the tunnel, following the signs east, to the next door. Open the door and splash the Splicers in the room with Security Command to trigger the Security Camera alarm. Hack the Security Camera above the door and continue straight ahead, following the signs to Core Access.