Securement Silo PHI in Once Human can be found in the southern Iron River region. Read on to learn more about Securement Silo PHI including its location, recommended level, secret room or seepage zone, as well as a walkthrough, and the rewards you earn for completing it.

Securement Silo PHI Location and Recommended Level

Located in the Iron River Region

Manibus / Evolution's Call	Prismverse's Clash
Recommended Level
・Normal: Lv. 25 (1 Player) ・Hard: Lv. 50 (3 Players) ・Pro: Lv. 60 (4 Players)	TBD

Securement Silo PHI can be found in the southern part of the Iron River region with Evergreen Southbank being the closest teleportation tower and Greywater Industrial Zone as the closest settlement.

Make sure you're also at the appropriate level before taking on the dungeon to avoid dying easily.

Iron River Region Guide

Securement Silo PHI Walkthrough

Securement Silo PHI Objectives

Jump to a Section
Head for the Central Control Room Continue Through the Hallway on the Right Enter the Central Control Room Eliminate the Nest Sacs Defeat the Boss Tombstone

1. Head for the Central Control Room

Upon entering the silo, you will need to make your way to the Central Control Room. To get there you need to pass through the first room then exit through the door on the left. There are a few enemies in this room you will have to clear.

Avoid The Black Liquid On The Floors

Try to avoid stepping on the black liquid on the floor as this causes your sanity to drop.

2. Continue Through the Hallway on the Right

After walking through the door, turn right on the hallway to continue making your way to the Central Control Room. There will be a few more enemies in this hallway as well as a Nest Sac you need to clear.

3. Enter the Central Control Room

At the end of the hallway, enter the Central Control Room on your left. There are enemies scattered throughout the room but you can take most of them out from the entrance of the room.

There is a gear crate in the room with the vines on the wall. To access the crate, you can throw a molotov on the vines to get inside the room.

Before leaving room, you can use the elevator nearby to reach the secret room.

Get the Access Card from the Gear Crate

After clearing the enemies, enter the cube in the middle of the floor and get the Rosetta Access Card from the gear crate. You will not be able to access the next room without this key card.

4. Eliminate the Nest Sacs

Use the key card to get to the next room then clear all 4 Nest Sacs. There will also be a few elite enemies in the room such as a Mayhem, a Watcher, and a few Gnawers so be prepared to fight.

Avoid The Black Liquid Once Again

Just as with the first room, try to avoid stepping on the black liquid on the floor as this will cause your sanity to drop.

5. Defeat the Boss Tombstone

After clearing all the Nest Sacs, Tombstone will spawn in the area. Aim for its belly sac or the tumor on its back as these are its weakspots. After defeating it, collect your rewards and leave the area through the portal to complete this silo.

Securement Silo PHI Secret Room (Seepage Zone)

Secret Room Objectives

Jump to a Section
Enter the Elevator in the Central Control Room Walk Down the Hall Through the Double Doors Defeat Rainfall Reaper Enter the Portal

1. Enter Elevator in the Central Control Room

The secret room for this silo is located in the Central Control Room and can be accessed by taking the elevator. Upon entering the Central Control Room, continue walking straight and the elevator should be on your left.

2. Walk Down the Hall Through the Double Doors

When the elevator stops, continue left through the hallway all the way to the room with the double doors.

Wait for the objects in the room to float and the doors should open to reveal the next area.

3. Defeat Rainfall Reaper

Upon entering the area, you will find various enemies but your main objective is to take down Rainfall Reaper. Aim for the umbrella on its head as this is its weakspot.

4. Enter the Portal

After defeating Rainfall Reaper, enter the portal in the area. This will lead you to a room where you can get your loot and, if you're lucky, Chefosaurus Rex or Pyro Dino!

Securement Silo PHI Rewards

List of Rewards

Securement Silo PHI Details

Securement Silo PHI Info

Recommended Level (Manibus and Evolution's Call)	Normal: Lv. 25 (1 Player) Hard: Lv. 50 (3 Players) Pro: Lv. 60 (4 Players)
Recommended Level (Prismverse's Clash)	Normal: Lv. 15 (1 Player) Hard: Lv. 50 (3 Players) Pro: Lv. 60 (4 Players)
Region	Iron River
Boss	・Rainfall Reaper ・Tombstone
Rewards	・Shoes Mods ・Stardust Source ・Energy Link ・Armor Mod Parts ・Weapon / Armor ・Eclipse Cortex Lv. 3 (Hard and Pro Mode)
Deviant	・Chefosaurus Rex ・Pyro Dino
Secret Room / Seepage Area?	Yes

Once Human Related Guides

All Securement Silo Guides

All Securement Silos

All Way of Winter Securement Silos

All Way of Winter Securement Silos