Search the Workshops for any information that could help you determine how to overload the core.
Jump over the Trap Bolts on the left to search the Crossbow and corpse on the ledge for ammunition, then sweep your way across the Upper Workshops area looking for items and clues. Each of the lockers can be opened—although most only contain Potato Chips—and there is a safe in the far corner.
Safe
Contents: 6 Frag Grenade, 12 00 Buck, 6 Steel-Tip Bolt
This safe is located in the Upper Workshops area, off to the far right-hand corner. The U-Invent machine nearby should be able to accommodate any needs you have for an Automatic Hack Tool, but don’t be afraid to use the Buyout option either or to skip this one altogether if you’re not in need of Frag Grenades or 00 Buck.
Equip the Electro Bolt 3 plasmid and descend the stairs to the Lower Workshops. Quickly stun and hack the two Turrets flanking the entrance to Kyburz’s Office. With your back to Kyburz’s Office, locate the crawlspace door on the right-hand side, just below the steps. This leads back beneath the main staircase and contains several storage crates filled with invention components, as well as a very well-hidden Audio Diary.
Exit the crawlspace and search the area near the Gene Bank at the base of the stairs. There is another valuable Audio Diary here, on which Kyburz mentions his “device”. It’s time to find this thing and see what Kyburz had in mind! Frisk the body that is lying in the center of the floor for yet another Audio Diary of Kyburz’s then continue south towards the Big Daddy corpse. Head up the steps and look behind the toppled desk for another crawlspace.
Sneak your way through the mechanical access shaft to Kyburz’s secret workshop. Here you’ll find the Damage Research tonic and the all-important “Assembling the Bomb” Audio Diary. The bomb casing is on the table across the room from the desk, and it’s a looker!
Objective 5: Finish Kyburz’s EMP BombKyburz was working on a device that would overload the central harmonic core in Hephaestus. Unfortunately, he never finished it before he disappeared. You’ll have to finish his work. Take all the required components to the Workshop Area where the casing is. Place them in the bomb casing to complete the bomb. 
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In order to finish the EMP Bomb you have to find four R-34 Wire Clusters (taken from Big Daddy corpses), two quarter-cans of Ionic Gel, and one Nitroglycerin Charge. Start the search for the missing parts by exiting the secret workspace and taking the R-34 Wire Cluster from the dead Big Daddy near the steps. With that first cluster in hand, turn your attention on the Elite Bouncer that’s been patrolling the Workshops the whole time you were there. The Turrets you hacked earlier will join in the fight—especially if you hit the Big Daddy with the Security Bullseye plasmid—and you should be able to finish it off with a Heat-Seeking RPG or Frag Grenade. Take the R-34 Wire Cluster from it and head upstairs.
Head back to the far corner of the Upper Workshops where the safe was and locate the single Quarter-Can of Ionic Gel on the table. You’re halfway there! The rest of the components, Nitroglycerin Charge withstanding, are located outside the Workshops. Load up on ammo at the U-Invent machine and head back outside to the Hephaestus Core.
Once on the circular walkway, turn to the right and search the Elite Bouncer corpse for the third Wire Cluster. The second Quarter-Can of Ionic Gel is just beyond it, atop the machinery down the ramp. Lastly, you’ll be able to find the final R-34 Wire Cluster in the back of the Elite Bouncer patrolling the Hephaestus Core area. Pull out the big guns and have at it! Yank the cords from its back and return to the Lower Workshops; it’s time to search Kyburz’s Office.