Submerged Superstructure

Submerged Supestructure is a late-game region exclusive to the Downpour DLC. It is accessible by every Slugcat except and.

Overview
Submerged Superstructure is the remains of 's 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  can enter the region if they have enough.

It is implied that the or some other creature of or after its time explored the Submerged Superstructure themselves, as the  found inside before the Rivulet's story has been given to Moon.

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 Moon's Memory Cortex 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 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 this 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 within this core reactor, in doing so restoring a fraction of the originally supplied power back to Looks to the Moon's facility, and consequently spitting the player out into Bitter Aerie. The upper exit cannot be used until this is done.

Be warned: 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.

Bitter Aerie
A cold desolate expanse 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. This area serves as one of the locations featured within the ending sequence for the Rivulet's campaign, and houses one of 's exclusive.

Trivia

 * Submerged Superstructure has the acronym MS in game files, which stands for Moon Superstructure.
 * Entering the Core without a Rarefraction Cell triggers the rain.
 * In room MS_AI green electrical charges can be found similar to the those found in.
 * 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.

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