MAP19: Undersea (1994 Tune-up Community Project)

MAP19: Undersea is the nineteenth map of 1994 Tune-up Community Project. It was designed by Dragonsbrethren based on Undersea by Brian Plumb and uses the music track "Adrian's Asleep" from Doom II. It takes place in a corrupted UAC oceanic base on Earth.

Secrets

 * 1) Open the computer panel directly right of your starting point to find green armor and shotgun shells. (sector 164)
 * 2) Go down the steps at the start and open the door. In the next room, head down the lift, and at the bend in the next hall, open the computer panel opposite of the UAC logo. You will find a rocket launcher and two boxes of rockets. (sector 20)
 * 3) In the rocky area at the northeast part of the map, approach the damaging moat and the central pillar will lower revealing a chaingun. (sector 26)
 * 4) In the halls west of the rocky area, just before the ground looks like snakeskin, there will be a silver ridge you can stand on. Stand on it and turn north towards the eyes. Shoot at them and the wall behind you will rise up, revealing a soul sphere. (sector 248)
 * 5) Inside the snakeskin room are several eye switches, some open and some closed. A closed switch is on the southern wall. Press it to find imps. The bloodfall next to the box of ammo can be walked through, allowing you to reach energy cells and a plasma gun. (sector 263)
 * 6) Take the rocky path southwest of the snakeskin room all the way until you reach a gargoyle switch. Upon pressing it, the wall behind you lowers revealing a cacodemon guarding another gargoyle switch. This one lowers the previous switch, but also lowers a wall to the north in the rocky path. Go to this new opening to find a door leading to a megaarmor. (sector 331)
 * 7) After getting the yellow key, return to the snakeskin room via teleporter and press the gargoyle switch to reveal a new compartment to the northwest with demons inside. In the northwest part of this compartment, head through the wall to find a chainsaw. (sector 65)
 * 8) Head all the way down the leftmost rocky path. Just before you reach the tech area, look to the left (east) to spot a section of the wall has a slit under it. Open this wall to reveal energy cells, shotgun shells, and partial invisibility. (sector 59)
 * 9) At the rocky path over lava, jump to the ledge on the east side. This counts as a secret and holds a radiation suit. (sector 130)
 * 10) At the rocky path over lava, cross the path and jump to the ledge on the west side. This counts as a secret and holds a soul sphere. (sector 129)

Current records
The records for the map at the Doomed Speed Demos Archive are:

Miscellaneous demos
''This information was last verified in its entirety on January 15, 2018.

Player spawns
This level contains seven spawn points:
 * 1) facing north-east. (thing 297)
 * 2) facing north. (thing 308)
 * 3) facing east. (thing 311)
 * 4) facing north. (thing 316)
 * 5) facing east. (thing 321)
 * 6) facing north-west. (thing 342)
 * 7) facing east. (thing 355)

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

Inspiration and development
This tune-up was designed to improve upon the underwater setting of the original UNDERSEA.WAD, utilizing vistas of the seafloor instead of the original's water-textured ceilings in cavernous areas. The corrupting influence of Hell was also emphasized, with the player even briefly teleporting to a castle in Hell to obtain the yellow skull key.