MAP02: Underwater Explosions (BTSX-E2)


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Secret map: 31

This level occupies the map slot MAP02. For other maps which occupy this slot, see Category:MAP02.

MAP02: Underwater Explosions is the second map of the second episode of Back to Saturn X. It was designed by Tango and uses the music track "Depth Charge" by Stuart Rynn. In the official add-on version, this level's name is Depth Charge, taken from its track title.

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Map of Underwater Explosions
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 interest[edit]


  1. Across from the starting area is a platform with a candle that is only accessible by a precise strafejump, with two sets of shotgun shells. If you fall into the gap below, this secret becomes unreachable. (sector 409)


An exploding barrel (Thing 677) has no flags set for any of the three difficulty classes, so it does not actually appear in the level.

Demo files[edit]

Areas / screenshots[edit]


Routes and tricks[edit]

Current records[edit]

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 data[edit]

Things 790
Vertices 2559*
Linedefs 2618
Sidedefs 4011
Sectors 444
* The vertex count without the effect of node building is 2055.


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

Technical information[edit]

Inspiration and development[edit]


See also[edit]


External links[edit]