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
There is a glitch in Survival whereas the player can reach an invisible ladder leading to a balcony.

This glitch does not register as a no-reach zone for Infected, and as such, no Spitter Goo will spawn under the Survivors. However, the Infected cannot reach the Survivors, and the only danger are Smokers and Spitters, but these can be avoided by staying off of the railings and crouching in the center of the balcony.

To get to this balcony, the player must travely towards the underground tunnel area. This will be blocked-off in Survival. There should be a neon-light sign hanging above the closed-off entrance to the tunnel; next to this sign is the Jesus-room balcony. The player should travel to the right of this balcony, next to the ivy. The player party should approach the ivy from the parallel brick wall. This will take a few attempts, but the players should discover an invisble ladder that leads to the balcony.

Once you figure out the ladder and become comfortable with climbing it, send someone to start the radio. The rest of the team should cover them as they return.

As long as the player party takes out any Smokers or Spitters, they will be untouchable on this balcony.