Purchase as many EVE Hypos, First Aid Kits, and Pistol rounds as you can from the Circus of Values and head into the Emergency Access area, beyond the Security Bot stuck between the doors. Hacking this Security Bot makes it your ally; watch as it flies towards the Leadhead Splicer around the corner and opens fire! This Security Bot proves valuable in the coming minutes. Climb the stairs to the Control Panel and activate it to try and unbar the gate. This sets off a security alarm, but also opens the door behind you.
Enter the narrow corridor beyond the control panel to find a Machine Gun near an Electrical Override switch. Grab the new weapon, flip the switch, and take aim at the gaggle of Splicers streaming down the stairs in the foyer below. These Thuggish and Leadhead Splicers make their way into the Emergency Access area and attack fast. Eliminate as many as you can with the Machine Gun from the balcony above the foyer, then head back down the stairs to where the Security Bot can be of more help. Use the Electro Bolt plasmid to stun them, then open fire with the Machine Gun—there’s simply too many here for the Wrench to be very effective. Once the last of the assailants have been defeated, head back to the foyer and go up the stairs and down the hall towards the surgery wing.