Welcome to Part 4 of Into Indie Games’ walkthrough for End of Abyss.
After getting her hands on the Mechanical Crank and Explosive Charge, Cel managed to activate the SCU deep within the heart of Factory West. The next SCU is located in Waterworks, which can be accessed via a door in Factory East.
This article is part of our End of Abyss Walkthrough & Guides Hub.
For more information about End of Abyss, check out its official website here.
Table of contents
Entering the Waterworks
There are two ways to get to the Waterworks, which is where we’ll find the next SCU to activate. The first way is to leave through the exit on the right and continue heading east. You’ll reach a room filled with Husks. Take them out and then head down.
The closest way to the Waterworks is through the bottom-left corner of this area shown in the image above. But instead, go right, along the walkway.
Fight past the enemies and head through the doorway up ahead You’ll reach a ladder and a path heading further to the east. The eastern path leads to the second entrance to the Waterworks. But we’ll need the Supervisor Key to unlock the door.
Climb up the ladder and head along the passage to the right. You’ll reach a room with a patrolling Security Pod Type A. Take down the enemy.
You’ll spot an Energy Node Door to the right. Trace the lines to find the Energy Nodes using your Scanner.
Head through the door and search the body to find the Supervisor Key. Pick it up.
Retrace your steps until you go down the ladder. Then head down the passage to the right.
Keep moving forward until you spot a door up a small set of stairs. Unlock the door using the Supervisor Key.
Go through the door. The ladder heading down takes you to the Waterworks. Before you do so, go up the ladder nearby to reach a Safe Room. You can save your progress before you head down to the next zone.
Reaching the Waterworks Safe Room
After coming down the ladder, open the door to the left and head through.
This takes you to a massive chamber. You can see a control panel to the left. But you don’t have to go there. Instead, head straight down to the next room.
This leads you to another similar chamber with large water tanks. Go up the steps to the right and enter through the door.
Go across the bridge and in through the door at the other end. There’s another path below, but you don’t need to go there yet.
Follow the path to reach a deactivated bridge. Use the Mechanical Crank to extend it and cross over to the other side.
Take down the Latcher and the Husk in the next room.
Go up, and you’ll see a door to the left at the far end. This unlocks a shortcut back to the ladder you used to enter the Waterworks. Unlock the shortcut and then head through the door to your right.
Take down the enemies in the area. The Safe Room is through the door to your right as soon as you get down the steps. Save your progress.
Obtaining the Operations Key
Before leaving the Safe Room, I suggest grabbing as much ammo as you can for your Riot Breaker. You’ll be needing it soon.
Leave the Safe Room and head to the door on the left, across the walkway.
The door will close behind you, triggering a gauntlet. Use the railing at the center to keep your distance as you fight off the wave of enemies. The doors will open after taking down all the enemies.
Go through the door on the left. You’ll see a panel across the bridge. Using it will lower the water level right below you. You can grab the glowing item below later while cleaning up the area. Activate the panel and head through the door beside it.
Run across the large overflow well and enter through the door on the other side.
Take the first door to your left after entering the next room.
This brings you to a dark, flooded area with narrow passages. You’ll need to be very careful as you move through this area. You’ll face two new enemies up ahead: the Parasitic Worms that latch on to you, and the Leechgut, a stronger Husk-type enemy that can deal massive amounts of damage if it gets close.
Go through the door up ahead to reach a large room. Take out the enemies here. Then check both doors on the left first. You’ll find a Complex Alloy in one of them, and the Map Data for the zone in the other. Then head through the door on the bottom-right.
There are some more enemies here, including a Latcher. Take them out. You’ll find another door heading down and then left.
Continue forward along the passage, taking the left path at the fork.
Go down, under the bridge, and then left to find a platform that you can climb up on. Be careful of the Leechgut hiding in the water as you progress.
After getting off the water, take the first door to your right. This will lead you down a corridor with a Safe Room at the end. Use the lever to unlock the door. This is the Safe Room you would reach if you entered the zone through the first path we showed you earlier.
Return to the previous room and take the door to the right at the far end corner. As you approach the door, you’ll meet a Husk Brute. This is a resilient Husk-type enemy that is even deadlier than a Leechgut.
Use the railing in the left section of the area to kite it around and take it out from a safe distance.
Head through the door once the enemy is down. This will take you to a small workshop. Pick up the Operations Key from the table, and return to the Safe Room you unlocked just now.
Reaching the Boss Arena
The boss arena for this zone is a short sprint from the Safe Room once you get the Operations Key. So I suggest taking any final preparations right now. You’ll want to bring your Riot Breaker and Grenade for this fight.
When you’re ready, exit through the door on the right.
Go down and right, along the flooded passage, and get up on the walkway.
You’ll reach a canal. Go down the stairs and jump down into the canal from the broken railing. Go up and then climb up to the walkway on the right as shown in the image above.
Take out the enemies nearby. Then go up the stairs and through the door across the bridge.
Go down the two ladders all the way to the bottom section.
Run around the walkway and down the ladder to the section below. Head through the broken section of the wall to trigger the boss fight.
Drowned Husk Boss Fight
The Drowned Husk is a melee-focused boss that can deal a lot of damage if it gets close to you. During the early stage, it will dive at you and try to hit you.
It also has a devastating grab attack that you don’t want to get caught in.
But the biggest weakness of the boss is that it can’t do anything if you manage to keep your distance. You can roll through every one of its attacks if you get the timing down, including the grab attack.
The boss also leaves openings to attack it with your Riot Breaker from a close distance whenever it misses its attacks.
Your key strategy for the fight is to keep your distance and wait for it to use its dive attack. Roll behind the boss and then use your Riot Breaker to take out a big chunk of its health pool.
After dealing enough damage, the boss gets staggered. At this point, you can get close and interact with it to use your Knife and deal massive damage to the boss.
When you get through half of its health pool, a short cutscene triggers as the Drowned Husk grabs a pipe from the wall. This is when phase 2 of the fight begins.
The fight essentially remains the same, with the exception that the boss now uses the pipe to attack you. The pipe has a decent bit of reach, so rolling backwards isn’t the best idea. Instead, roll to the side or through the boss to get around to his back. Kite the boss around and keep attacking it until it goes down.
Pick up the Vault Key once the boss is defeated.
Activating the Waterworks SCU
After defeating the Drowned Husk, head through the door at the far-left corner.
Go up the ladder and follow the passage to reach a control panel. Activate it to stop the flow of water.
Exit through the door on the right and drop the ladder down to open the shortcut.
From here, you’ll have to run all the way back to the canal that you saw earlier. Use your map to navigate through the zone. Get into the canal and then head up. With the water flow stopped, you can head to the upper section.
Go through the door on the left and down the ladder.
Keep following the path till you reach an elevator. Use it to go down the overflow well.
Open the door at the bottom and head through.
This brings you straight to the SCU room. Interact with the panel to open the door. Then activate the SCU to trigger a cutscene as the second SCU gets activated.
This concludes the fourth part of our End of Abyss walkthrough. For more interesting articles related to indie games, check out the links below:
- Into Indie Games Homepage
- Well Dweller Walkthrough Hub
- Nocturne (2026) Walkthrough Hub
- Rivage Walkthrough Hub – All Puzzle Solutions Under 25 Loops
- Lily’s World XD Complete Walkthrough
Muhit Rahman lives off two things: gaming marathons and endless cups of tea. He writes guides, reviews, and occasionally forgets that real life doesn’t come with checkpoints. His favorite genres are Soulslike and Metroidvania, with Dark Souls III, Hollow Knight, and Dota 2 forever holding top spots on his all-time list.
