RE9 ARK Security Room Safe Code: Unlocking the Sterilization Chamber

The ARK facility is one of Resident Evil Requiem’s most complex areas, and it’s got a safe tucked away in the Sterilization Chamber that’s worth cracking. The combination is a rotary dial type — right, left, right — and it changes depending on your difficulty setting. Here’s everything you need.

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The ARK Facility

The ARK is a high-tech complex central to the main story:

• Multi-level structure with distinct zones
• Contains several puzzles and collectibles
• Heavy story significance
• Multiple safes and hidden items

Key areas:

• Main control room
• Surveillance control room
• Sterilization chamber
• Security room
• Underground facility

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Safe Location

Where: Hallway adjacent to the Surveillance Control Room, ARK facility

Specific spot: Near the door that requires two orbs to open — the safe is on the wall in the Sterilization Chamber area.

How to get there:

ARK entrance
    ↓
Main control room
    ↓
Surveillance control room
    ↓
Adjacent hallway
    ↓
Two-orb door (need both orbs)
    ↓
Sterilization Chamber area
    ↓
Safe on the wall

Prerequisite: You need two orbs to open the door leading to this area. Find them by exploring the ARK’s main sections.

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The Combinations

Normal / Casual Difficulty

Right 10 → Left 90 → Right 20
(10R, 90L, 20R)

Insanity Difficulty

Right 20 → Left 0 → Right 70
(20R, 0L, 70R)

⚠️ These are different codes. If you’re on Insanity and using the Normal code, it won’t work. Check your difficulty before you start spinning.

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How to Enter the Combination

For a rotary dial safe:

1. Approach the safe and interact with it
2. First number — turn RIGHT:
   • Normal: Stop at 10
   • Insanity: Stop at 20
3. Second number — turn LEFT:
   • Normal: Pass 0, stop at 90
   • Insanity: Stop at 0 (don’t turn past it)
4. Third number — turn RIGHT:
   • Normal: Stop at 20
   • Insanity: Stop at 70
5. Confirm — the safe opens

Tips for rotary dials:

• Turn slowly and deliberately — don’t overshoot
• Right = clockwise, Left = counterclockwise
• Each number must be exact — close doesn’t count
• If you overshoot, you’ll need to reset and start over

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What’s Inside

Reward	Notes
Medical Supplies	First aid sprays, mixed herbs
Ammo	Various weapon ammunition
Other Resources	Materials and supplies

The ARK is a tough area, so these supplies are genuinely useful. Grab them before pushing deeper into the facility.

Is This Safe Worth the Detour?

Short answer: yes, but it’s a resource decision, not a story requirement. Here’s the honest calculus:

• If you’re exploring thoroughly (collectibles, files, trophies), you’re already walking past this hallway — the safe costs you ten seconds.
• If you’re speed running, the medical supplies rarely justify the orb-gating detour; skip it unless you’re critically low on healing.
• On Insanity, flip that logic — supplies are scarce enough that the detour pays for itself, and you’ll want the ammo more than the minutes.

One habit that helps: empty every safe before the area’s point of no return. The ARK has several one-way drops; anything you leave behind becomes a chapter-reload later.

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Finding the Two Orbs

The door to the Sterilization Chamber area requires two orbs. General locations:

• Orb 1: Explore the main control room and adjacent rooms
• Orb 2: Check the surveillance area and nearby corridors

Both orbs are found through normal exploration of the ARK — you won’t need to do anything unusual to find them. Just be thorough.

If you’re stuck on one: sweep every side room on the level where you found the first orb before going deeper. The ARK’s design consistently gates later floors behind items placed on the current one, and a missed desk or locker shelf is the usual culprit. The item pickup prompt is subtle at distance, so walk slowly along walls rather than sprinting down the center of corridors.

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Enemies in the ARK

The ARK has active enemy patrols. Before attempting the safe:

1. Clear the immediate area — don’t try to work the dial while being chased
2. Check your ammo — the ARK’s enemies are tougher than earlier areas
3. Know your escape route — in case you need to retreat

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Tips

1. Check your difficulty first — the most common mistake is using the wrong code
2. Clear enemies before attempting — you need focus for rotary dial safes
3. Get the orbs first — you can’t reach the safe area without them
4. Grab supplies before the final push — the ARK gets harder as you go deeper
5. Note the code in your own save notes — if you exit the game mid-dial, you’ll restart the combination from zero

How This Safe Compares to the Others

Requiem scatters several rotary and keypad locks across the campaign. The ARK safe is the only one whose solution changes by difficulty, which is why it generates the most confusion. The Raccoon City Police Station safes, by contrast, use fixed codes you can find documented in the environment — if you’re working through them in sequence, our RPD safe codes guide has all of those in one place. And if you’d rather have every lock, puzzle, and code on a single page, the all puzzle solutions guide covers the whole campaign.

For Speedrunners

• Normal: 10R, 90L, 20R — memorize it
• Insanity: 20R, 0L, 70R — different code, same approach
• Skip if the detour isn’t worth it for your route
• Practice the dial input once on a casual save — overshooting a number restarts the whole combination, and that hesitation costs more than the detour itself

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Wrapping Up

The ARK Sterilization Chamber safe is straightforward once you know the combination — the only real gotcha is that the code changes on Insanity difficulty. Use the right code for your difficulty, take your time with the rotary dial, and you’ll have those supplies in no time.

Quick reference:

• Normal/Casual: 10R → 90L → 20R
• Insanity: 20R → 0L → 70R

Still stuck elsewhere in the facility? The complete Requiem walkthrough tracks every chapter beat, including the orb locations if you haven’t found both yet.