The Underground

"It's a hole! Oh, excuse me, a historic hole."

- Nick

Underground is the second chapter in Left 4 Dead 2 ' s The Passing campaign. The Survivors exit the safe room and head through a sham "historic tour under the river". The second leg of this "tour" takes them through sewers where they must open a gate, setting off an alarm that causes a Gauntlet Event. They must then run through the sewer to reach the safe room.

Campaign
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The Survivors
There are at least three separate points of no return within the last leg of the level: One being the stairs leading down into the sewers and the other two being both of the starts in the marathon gauntlet. Use extreme caution when dropping down from each of these points.

The Infected
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Survival
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