The Problem

I cannot get into the Containment Block. There is some weird sound-based lock that I do not understand.

The Solution

The Bio-Acoustic Key unlocks sound-based security doors — the most notable being the entrance to Containment Block DIRAC. This is tied to Main Objective 17 and represents one of the major mid-to-late-game progression gates.

Getting There From Cascade Labs, take the main elevator to Level 2. Exit the elevator and navigate toward Containment Block DIRAC. The first door on your right after entering the Containment area is your entry point. Before stepping through, locate the whiteboard on the wall just outside the entrance — it contains the navigation instructions for the interior. Read it. The Containment Block layout is intentionally confusing, and the whiteboard is the in-game map. Skipping it means wandering blind through hostile territory.

What You Need

• Bio-Acoustic Key: In your inventory, not in storage. Check before leaving base.
• Keypad Hacker Tier 3: Some interior doors require Level 3 security access. A lower-tier hacker will not work, and there is no crafting bench inside Containment to upgrade on the spot.
• Healing Briefcase (see healing guide) at a nearby forward base: The Containment approach is long. If you die deep inside, you want a short recovery run, not a full restart from Office Sector. Place a Briefcase (6 HP/sec) and a Bed in a safe room on Level 2 before pushing into DIRAC.
• Hazmat Suit (see armor and protection guide): Containment has radiation pockets. 90% radiation reduction is not optional.

Retreat Triggers Certain areas inside Containment Block have preset retreat triggers — enemies will aggressively push you out if you stay too long in specific zones. These are not bugs; they are designed pressure mechanics. If enemies suddenly swarm from multiple directions, you have likely triggered a retreat zone. Fall back to the previous safe room, reset, and approach from a different angle or with better positioning.

After the Door Opens Once the Bio-Acoustic Key unlocks the sound-based security door, you gain access to containment cells containing loot, lore items, and progression-critical items. The security system reset (a separate main story objective) further opens previously locked cells throughout the block. You may need to return after the security reset to access everything — the first trip opens the door; the second trip cleans out the cells.

Lighting Matters Containment Block interiors are dimly lit. Bring a portable light source or ensure your base lighting extends into the approach corridor. Enemies in darkness are harder to spot and hit. A wall light placed at the entrance before pushing deeper gives you a safe fallback point with visibility.

Step-by-Step

1. Craft a Healing Briefcase (Briefcase + 8 Anteverse Wheat + 2 Solder + Fibre Optic Cable) and place it with a Bed in a safe room on Cascade Labs Level 2 — this is your forward respawn point.
2. Equip the Hazmat Suit (90% radiation reduction) and carry a Keypad Hacker Tier 3.
3. Confirm the Bio-Acoustic Key is in your inventory. Take the main elevator to Level 2.
4. Navigate to Containment Block DIRAC. Take the first door on the right.
5. Read the whiteboard outside the entrance — it is the in-game navigation guide for the interior layout.
6. Enter and use the Bio-Acoustic Key on the sound-based security door.
7. Move deliberately. If enemies swarm aggressively, you have triggered a retreat zone — fall back to the entrance and reassess.
8. After the initial entry, return after the security system reset to access all containment cells.

Common Mistakes

• Skipping the whiteboard outside the entrance and wandering the Containment Block blind.
• Bringing a Keypad Hacker Tier 1 or 2 to a Level 3 security door — no crafting bench (see Crafting Bench upgrades) inside means a wasted trip.
• Pushing into Containment without a nearby respawn point — dying deep inside means a full restart from Office Sector.
• Ignoring retreat triggers and staying too long in pressure zones — fall back, reset, re-approach.