Submerged Superstructure

Submerged Superstructure is a late-game region exclusive to Downpour. It is accessible by every Slugcat except and. It exists as one of the largest regions in the DLC, wielding 134 rooms. It harbors various decayed remnants of superstructure and sparsely illuminated submerged caverns filled with aquatic creatures.

Overview
Submerged Superstructure is the remains of superstructure, sunken beneath the 's waves due to the damage her can suffered in its legs after  first attempt to expel the Rot. While it is best explored by the and plays an important role in their story, most s can enter the region if they have enough.

The region is generally comprised of various, deeply submerged, dimly lit spaces. The dilapidated remains of the superstructure are burgeoning with various plants, as well as aquatic creatures such as, and s. Curiously, s are present in the deeper sections of the region, making it an arduous task to traverse the region with the gauntlet of creatures. s can appear in large quantities in the lowermost water-filled sections.

In Rivulet's campaign, a is to be inserted in the central subregion. After this, the middle level of Submerged Superstructure and the Looks to the Moon subregion of periodically experience functional recovery and gravity reduction.

If the player comes here as the, a few rooms have been changed to make getting to The Heart easier, and some power and gravity has been restored. Saint has a significantly easier time navigating Submerged Superstructure than other Slugcats (besides Rivulet) as their Ascension flight ability allows them to travel faster than Rivulet through water, without using up any breath.

Saint can find an additional inside of Bitter Aerie, who comments on their tenaciousness to get there despite the lack of a reward. This Echo is not required for the Pilgrim passage, nor is it required to complete the Saint's campaign, and is incredibly difficult to get to without having completed their pilgrimage already.

It is, however, possible to reach the Echo without going through the Heart or completing Saint's pilgrimage. This route through Looks to the Moon's Memory Conflux is probably unintended, as the surfaces in a certain room are technically unable to be grappled onto by Saint, but jumping even on the few frames their tongue makes contact with the surface gives Saint enough upwards momentum to scale the wall. Another option is to use the s that spawn nearby.

Points of Interest

 * Pearl_DM.png Bright Yellow Pearl
 * (pre- only)

Vents
This area comprises of the lower half of the region, the underbelly of Looks to the Moon's superstructure that is well below the sea level. It is deeply eroded and flooded by water, of which an ecosystem of underwater flora and fauna flourishes within these depths, mainly populated by, s, and. These lower passages have been transformed into something comparable to an underwater cave; a series of intertwined curving tunnels that have been narrowed and shaped by a barnacle like material, coating almost every surface with a thick rough coral layer. The majority of the rooms are fully underwater and mainly illuminated by spaced out patches of, with only a handful of air pockets and breathable rooms, of which an abundance of and  reside within these oxygenated cavities.

The Heart
This area is the last stretch of the flooded underground portion of Submerged Superstructure, featuring a wide flooded conduit that leads into a central chamber for which the, obtained by the Rivulet from Five Pebbles' infested can, is to be relocated. The conduit has up to 7 connections to other parts of the region, and contains sporadic branch rooms to restore breath. Relocating the Cell restores a fraction of Looks to the Moon's power to her facility, and causes the core to fill with water, forcing the player to exit or drown. The upper exit cannot be used until this is done. On leaving the core, the player is transported by a strong current up the shaft in The Heart, through a one-way passage into Bitter Aerie.

Entering the core reactor without the Rarefaction Cell traps the player, forcing them to quit to the menu or wait until the Rain kills them. Entering the core as a other than Rivulet or  triggers the Rain. Entering as Saint kills the player.

Notably, powerful currents periodically arise within The Heart subregion after the Cell insertion, propelling the Slugcat towards certain locations and making navigation difficult.

Bitter Aerie
A cold desolate expanse at the top that the Rivulet is expelled to after restoring power to Looks to the Moon's facility. The lower area contains partially flooded tunnels and pipes, while the upper area contains a series of ascents and descents through steep cliff-sides intermixed with wide surface areas exposed to the snow. In the west these paths converge together to lead to a one-way Karma Gate, the only and final exit out of this region, containing sparse life in the preceding mountains and passages underneath the surface. While in this area, Passaging is disabled.

Auxiliary Transmission Array
An isolated high-altitude tower that can be reached through the right uppermost pathway in Bitter Aerie, whose snowy skies are home to s. This area serves as one of the locations featured within the ending sequence for the Rivulet's campaign, and houses one of 's exclusive es.

Trivia

 * Submerged Superstructure has the acronym MS in game files, which stands for "Moon Superstructure".
 * The Vents have many of its room exits hidden for non-Rivulet Slugcats. The exits that are shown highlight the easiest path through the subregion.
 * Entering the Core without a Rarefaction Cell triggers the rain.
 * In room MS_AI green electrical discharges can be found, similar to the those found in.
 * It is implied that the explored the Submerged Superstructure themselves, as the  found inside before the Rivulet's story has been given to Looks to the Moon.
 * Entering Bitter Aerie through the use of a warp mod as any character but Rivulet or Saint reveals that there isn't any snow there, as it is merely a shading effect that isn't in play for any other campaign.
 * Additionally, attempting to leave Bitter Aerie as Spearmaster or Artificer softlocks the game, as it attempts to load a location that doesn't exist for them.


 * A muffled audio file of MOON_SIREN will play should the Rain begin to approach, being the same audio file that plays in the prior-collapse.
 * This suggests that even despite the superstructures current condition, it still retains rudimentary functionality or power.

Interactive Map
Interactive map ported by Dual, Original by Henpemaz.