MAP04: Dirty Water (BTSX-E2)

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This level occupies the map slot MAP04. For other maps which occupy this slot, see Category:MAP04.

MAP04: Dirty Water is the fourth map of the second episode of Back to Saturn X. It was designed by Mike Alfredson (Use3D) and Richard Frei (Tarnsman), and uses the music track "Lost City," by Sarah Mancuso (esselfortium). In the official add-on version, this level's name is Sunken Sanctuary.

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Map of Dirty Water
Letters in italics refer to marked spots on the map. Sector, thing, and linedef numbers in boldface are secrets which count toward the end-of-level tally.


Other points of interestEdit



  1. Near the start is a small, shrine-like building with a short altar with a heart in the center, with two revenants and a mancubus within. From the center altar facing to the east, hit the pillar with the spine-like texture and candles behind it. That wall will raise, along with a wall to its north, revealing a chaingun, two boxes of bullets and three stimpacks. (sector 52)
  2. At the very southwest of the map, ride the lift into the building with a blue switch inside. When you approach the blue switch, a monster closet containing two revenants will open. The back wall of this closet is made of one large slab rather than several smaller ones; opening it will reveal a teleporter, leading to a small room in the far east with a soulsphere. (sector 1001)


  • After using the yellow and blue key, head right facing them onto the now raised walkway. Go up to the dark door and it will lower, revealing a mancubus and a teleporter to the left of him. Take the teleporter to go back to the beginning into a closed section to grab one energy cell pack, two stimpacks and 10 armor bonuses.


Demo filesEdit

Areas / screenshotsEdit


Routes and tricksEdit

Current recordsEdit

The records for the map at the Doom Speed Demo Archive are:

Run Time Player Date File Notes
UV speed
NM speed
UV max
NM 100S
UV -fast
UV -respawn
UV Tyson
UV pacifist

The (absence of) data was last verified in its entirety on February 21, 2022.


Map dataEdit

Things 1042
Vertices 5617*
Linedefs 6494
Sidedefs 8975
Sectors 1086
* The vertex count without the effect of node building is 5172.


This level contains the following numbers of things per skill level:

Technical informationEdit

Inspiration and developmentEdit


See alsoEdit


External linksEdit