As soon as you hit the bottom of the stairs an alarm will go off. Watch out for the robot that comes out of the doorway at the end. Once you've eliminated all hostiles (beware of other hostiles in the vicinity), head down to the end of the room and turn right.

You'll notice a few additional hostiles down near the far end. Proceed with caution and take them out.

When you finally reach the far end of the room, and you've eliminated all hostiles, take a look around. There is at least one container and a healing arch, which is just ahead to the right. After collecting anything of value and healing, head through the door and follow the corridor.

It's safe to head through the door at the end and turn left.

You'll notice a control panel ahead on your left. It allows you to overload and destroy one of two turrets up ahead. Blow up the turret using the control panel and proceed with caution.

There is a second turret on the ceiling near the far end of the room. Take it out then head down to the end of the room. You should be safe from hostiles for the moment.