Six Security Silos are a quick and relatively effortless way to get loot Once a man. In the Red Sands zone you will find Securement Silo Theta, a level 45 dungeon with a secret area, a puzzle, and an additional boss.
How to Get to the Puzzle Room in Securement Silo Theta
The silo is filled with the standard deviations you’ll be mowing down for hours. After going through a few branching hallways that all lead to the same location, you’ll come to a room with two exits. The one on the left, filled with black sludge and red barrels, leads to the final boss. The door on the right, directly before the entrance, leads to an optional second boss, so head that way.
In this room, there is a statue lit by a lamp. Press F to rotate it and travel to the Percolation Zone. Continue through the long tunnel, where at the end you will find a ladder leading to a enormous room with six statues. Among them, reflected in the water, is one of Once upon a time a man giant Deviations, but he’s not actually in the room. You have to solve the puzzle to facilitate the boss get to the other side so you can defeat him.
Solving the Puzzle in Silo Theta by Once Human Security

Solving the puzzles in Silo Theta is effortless once you know what to do. Like the statue at the entrance to Seepage Zone, they all have “Rotate” prompts. Rotate each figure so it matches its reflection in the water.
This will summon a giant Deviation into the room with you. This boss has a glowing blue lump on one of its legs, a clear tender point. Shoot the lump to stun the creature, then drop it on its bulging head. That’s it, head back up the ladder and to the statue by the entrance. Spin it around again to return to the real world, where it’s time to defeat the main boss in Containment Silo Theta.
The last fight is a bit more arduous because Once upon a time a man boss summons extras. Use the pillars for cover and your Deviant to draw aggro. Several explosive barrels in the room will deal extra damage to the boss. Now that everything has been killed and looted, return to Nalcott with your loot.