Sewer, also known by its prototype name The Sewers Below, is a scrapped level created by Richard "Levelord" Gray for Duke Nukem 3D.
In the non-shareware version of Duke Nukem 3D v0.99 Beta, it appeared in an unused episode known as Shutdown At Ground Zero, which was later replaced by Shrapnel City. The level was cut from the final version of the game, but it has since been made freely available to download online.
Other scrapped maps released by Gray post-launch include Sweeney, Chuckles, and Cigam.
Walkthrough
* SEWER.MAP - The Sewers Below (Unused Level)
Map

Development history

Sector chronology. Bright blue=oldest; bright red=newest. Oldest sectors in ascending order include: crack in sewer wall that automatically explodes and reveals a massive explorable chasm (sector 0), inside the explorable chasm, toxic waste channel that pours down from the side across from the chasm wall, bottom of the pit leading to the nuke button.
Links
- Download the map (via the Duke Nukem Repository)