Start making your way back to the station. Throw off the suit and head up the stairs while you make contact with Ricardo. After getting cut off, watch as an Alien attacks the survivors you saw earlier.
Avoid the Alien and especially the confused survivors who clearly find you more of a threat than the deadly beast running around the room. Enter the elevator and go to the lobby to find a Facehugger wrapped around Ricardo's neck and face.
Keep moving, going down the stairs and into the area with all the guards. Continue to try and sneak around, but let the Alien do all the dirty work. Use vents when at all possible.
Reach the elevator to end the mission.
Nightmare Mode
Alien Isolation Nightmare Mode is the "ultimate Alien: Isolation experience," challenging players to explore Sevastopol with a broken motion tracker, no health bar or ammo counter, and all maps offline.
In Nightmare Mode, survivors don't drop ammo, fuel for your flamethrower is scarce and burns faster, and the Alien's upgraded AI makes it an even more hostile and adaptive foe.
Here is a video of Nightmare Mode Mission 16:
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