HZD: The Frozen Wilds – Waterlogged Side Quest

Waterlogged is a Side Quest in Horizon Zero Dawn: The Frozen Wilds DLC. This walkthrough shows how to complete the quest.

Recommended Level: 30
Location: Greycatch, south of the Dam (see screenshot below)
Requirement: having finished Into the Frozen Wilds
Quest-Giver: automatically obtained when in the area
Reward: 7.500 XP, 3 Bluegleam
Trophy:  Drained the Flood

Objectives:

• Find an Entrance
• Enter the Greycatch
• Explore the Control Room
  • Examine the Schematics
• Find the Source of the Shouting
• Talk to the Oseram
• Follow Gildun
• Close the First Sluice Gate
  • Find a Path to the Other Side
  • Unblock Sluice Gate
  • Lock the First Sluice Gate
• Follow Gildun
• Find a Path to the Second Sluice Gate
• Lower the Emergency Ladder
• Close the Second Sluice Gate
  • Find a Path to the Other Side
  • Look for the Counterweight
  • Get on the Counterweight
  • Lock the Second Sluice Gate
• Recover the Emitter
  • Kill the Snapmaw
  • Search the Snapmaw
• Restore Power to the Door
  • Return to the Control Room
  • Replace the Emitter
• Go to the Storage Room
  • Find a Power Cell
  • Talk to Gildun
• Replace the Power Cell
• Go to the Overflow Basin
• Enter the Overflow Basin
• Find the Source of the Sound
• Talk to the Banuk Drummer

When Aloy gets close to the Dam roughly in the middle of the Cut, this quest will automatically activate. Aloy will notice a deluge in the area and wants to explore the Greycatch Dam a bit further. Once we enter, a computer voice will speak to us and Aloy heads to the Control Room to see what this is all about. Upon entering the control room, we will see a large monitor in the middle of the room as well as a small puzzle on the right wall, which is missing a piece. Use your focus to scan all the things.

You will also see a shape of another human nearby to the left side. This is where we want to be headed next because we cannot solve the puzzle as of now due to the missing ring to solve the mechanism. Behind a locked door, we’ll encounter Gildun – a rather clumsy Oseram treasure hunter. He wants to obtain a certain artifact and requires our help to do so – next to shutting down the flood he accidentally caused.

Next thing we know is we are solving a few puzzles as his accomplice – a few jumps and climbs here and there, nothing fancy. After closing the second Sluice Gate, we are good to jump down into the water to go look for our missing piece. Gildun suspects that the Snapmaw in the area might have swallowed it, so better check on that. Killing and looting the machine confirms his suspicion.
Before heading upstairs again, open the door on the ground floor – there will be a small pipe puzzle behind it. Use your focus to see which ones have to be turned to completely drain the dam. While this is not part of the quest, it is required for the trophy. See the screenshot below for the solution.

Once we’ve solved this puzzle, it is time to head upstairs again and solve the door-locking-mechanism, now where we have the missing spare piece. Insert the piece, turn the halos according to the table on their left and enter the Storage Room. Poor Gildun doesn’t find what he came for, but we’ve got ourselves a Power Cell which we can insert in the monitor in the adjacent room.
After this, we will see that our operation was successful. Now Aloy wants to head to the Overflow Basin to see how it looks now. Use the fast-travel, if you have unlocked the campfire close by. Once we arrive, we see that the Basin is crawling with some big fellas.
Our task is obvious: Jump in there and make ourselves some temporary friends. Once they are dealt with, climb down the ladder marked on the screenshot above. There we will find a Banuk drummer to talk to, which concludes this quest and gets us our Drained the Flood-trophy.