Security Level 2 vent route: avoid the front door and enter through the infirmary

Prerequisites and Preparation

Before attempting to access locked areas in the Security Sector, ensure you have the following items:

• Melee weapon: A Stun Baton or similar reliable weapon helps handle hostile creatures like Carbuncles, Volatile Exors, and Neophytes that may patrol the area.
• Slushie Bombs (optional): Useful if you encounter Volatile Pests or Exors in vent areas, as these enemies are vulnerable to them.
• Keypad Hacker access: Security doors and shortcut routes can depend on the appropriate Keypad Hacker tier. Confirm the door requirement before treating a route as open.

The primary objective is navigating through the Security Sector to unlock routes back to the Office Sector and other areas. A secondary objective involves locating key items like the Security Sector map and opening shortcuts.

Route goal before entering the vent

Vent routes are useful because they change access, not because they are good places to improvise.

If the vent no longer serves the stated goal, back out and reset from a named landmark.

Understanding the Security Sector Layout

The Security Sector connects to multiple areas and contains several important features:

• Double blue doors: Unlock these to open a route back to the lobby area.
• Red lockers: Can contain Light Gun Repair Kits and Intermediate Gun Repair Kits. Always check these for useful supplies.
• Equipment cage: Located past the red lockers, but unfortunately cannot be opened according to available information.
• Keypad: Found past the red lockers, up a ramp. Interact with it to unlock a security door.
• Laboratories Door: Opens a path back to the Sister of the Unlost and Cascade Laboratories.
• Repair Bay: Contains another locked door to the right that can be opened.

The Security Sector lobby features a glowing red map on a wall to the right: grab it for navigation reference.

Vent Routes and Navigation

Vents serve as critical pathways in multiple sectors. Here are the vent routes supported by sources:

Reactors Sector Vent

Located in the Server Room after destroying crates in the center of the room. Inside the vent:

• Go right: You'll encounter a spinning metal fan (similar to the one at the start of the game). This path leads to glass doors that open back to the central room.
• Unconfirmed branch rule: If a branch does not have a clear landmark or return line, back out and re-enter from the known side instead of crawling deeper blind.

From the vent, you can access the second floor via glass doors. Be cautious of Neophytes patrolling the second floor. All doors on the right are locked, so walk forward underneath graffiti that says "Burn in the Seven Rays."

Office Sector Vent

Found in the Office Sector lobby area:

• Vent without light above it: Contains a spinning fan blade that is impassable without getting killed. Return later with proper equipment.
• Vent with yellow light above it: Safe to enter. Contains a Carbuncle enemy inside. Dismantle vents for Metal Scraps before proceeding.

Route Workflow for Security Sector Access

Follow this numbered sequence to navigate the Security Sector effectively:

1. Enter the Security Sector from the Office Sector or Cascade Laboratories transition point.
2. Locate the double blue doors and unlock them to open a shortcut back to the lobby.
3. Search red lockers for Light Gun Repair Kits and Intermediate Gun Repair Kits.
4. Walk past the equipment cage (cannot be opened) and head up the ramp.
5. Interact with the keypad at the top of the ramp to unlock the security door.
6. Open the Laboratories Door to create a path back to the Sister of the Unlost and Cascade Laboratories.
7. Return to the lobby and go to the Repair Bay. Turn around to find another locked door to the right that can be opened.
8. Navigate to the Security Sector lobby and grab the glowing red map on the wall.
9. Go down the long corridor with the "Office Sector" sign above it. Hack the keypad at the end to open a door to the Office Sector lobby.

Route Decision Table

Practical Route Choices

When navigating between sectors, consider these path tradeoffs:

• Security Sector to Office Sector via keypad corridor: Shortest route but requires hacking ability. Opens a direct connection between sectors.
• Security Sector to Cascade Laboratories via Laboratories Door: Opens additional loot opportunities but extends travel time. Use when you need Laboratory materials.
• Reactors Sector vent route: Provides access to second floor areas but requires dealing with Neophyte patrols and locked doors on the right side.

For first-time access, prioritize unlocking the keypad corridor between Security Sector and Office Sector, as this creates the most useful shortcut for future navigation.

Failure Recovery and Common Mistakes

Problem: You cannot open a locked door in Manufacturing West Stop spending time trying to force it. Search for alternative routes through vents, caves accessible from train tracks, or underwater areas. Available sources confirm that some doors in this area cannot be easily opened.

Problem: You encounter a spinning fan in a vent Do not attempt to pass through. Return later with proper equipment or find an alternative route. The fan will kill you if you try to force past it.

Problem: You cannot find the keypad in Security Sector Look past the red lockers, up the ramp. The keypad is located there and unlocks the security door.

Problem: You are lost between sectors Use the glowing red map in the Security Sector lobby for navigation. Alternatively, return to the Office Sector lobby and reorient yourself from there.

If a route attempt costs more than one full repair cycle before reaching your objective, reset at a safe location. Sector navigation is about unlocking shortcuts, not long loot sweeps. Prioritize opening routes between sectors, then return for exploration with proper equipment.

After shortcut unlock

Once the vent route opens a useful path, treat the next trip as a separate objective.

The common mistake is unlocking a shortcut and then immediately spending the saved time on risky side rooms. Bank the shortcut first.