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Mass Effect Hints
The Back Door
1 of 4: Return to the Scientist Barracks area and find the short hallway leading off from its NW corner.
2 of 4: Go through the hallway's two doors to get into a big maintenance tunnel.
3 of 4: Be ready to shoot down a rachni soldier at the other end of the tunnel.
4 of 4: As you go through the door to the Ventilation Room, you'll get the "Sneaking In" objective.
