This area is patrolled by several Geth Troopers and a Geth Shock Trooper. When you've taken them all out, a short cutscene will launch depicting a less-than-friendly-looking creature peering at your squad through the glass to the west.
When it's over, a small group of "Rachni" Workers will charge your party (and explode, so keep them at a distance) while two Rachni Soldiers begin making their way down the hallway to the west.
3 - Terminal
Be careful when you approach this terminal as a Rachni Soldier will rise up through the floor vents to the north. When the area is secure, decrypt the terminal to reveal the personal log of someone named Administrator Tartakovsky. It seems that Mr. Tartakovsky isn't too happy about losing shipments to mercenaries out in the Macedon system.
As it turns out, these are the same mercenaries responsible for abducting Dahlia, the girl you may have been hired to find as part of the "Asari Diplomacy" assignment given to you by Nassana Dantius during your return to Citadel. This will take you to the planet of Sharjila in the Macedon system of the Artemis Tau cluster.
