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Valencia

Guide Curator at GladiatorBoost

I’m the voice behind the blogs here at GladiatorBoost—diving deep into the gaming world to bring you guides, updates, and stories that actually help (and maybe even entertain a little). Whether it's breaking down the latest boosts or highlighting cool moments in your favorite games, I’m here to make the digital grind a little more fun.

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Keys in ARC Raiders are some of the most valuable items you can carry into a raid. They unlock sealed rooms filled with higher-tier loot, rare crafting components, and sometimes blueprints. However, not all keys function the same way.

The Dam Testing Annex Key stands out because it doesn’t open just one room — it gives you a choice between two locked doors inside the same building. That decision can significantly impact your loot value and raid success.

In this complete guide, we’ll cover:

• Where to use the Dam Testing Annex Key

• Which door is better if you only have one key

• What loot to expect

• Best loadouts and map conditions

• Safe extraction strategies

Dam Testing Annex Key Overview

Most keys in ARC Raiders open a single, clearly defined room. The Dam Testing Annex Key is different:

• There are two locked rooms inside the Testing Annex.

• Using the key on one door consumes the key permanently.

• You cannot open both rooms unless you bring two keys.

This creates a risk-reward decision. If you only carry one key, you must choose wisely.

Because key drops are random, farming them consistently can take time. If you want to skip RNG-heavy runs, ARC Raiders Boosting can help accelerate access to high-tier loot and key runs safely.

Best Map Conditions for Key Runs

Before deploying to Dam Battlegrounds, check the current map condition.

Ideal Conditions:

• Electromagnetic Storm

• Night Raid

• Cold Snap

These conditions increase loot value, which directly improves what you can find inside locked rooms.

Important Warning

During Night Raid and Electromagnetic Storm, hatches are closed. That means:

• Extraction options are limited.

• You’ll likely need to use elevators.

• PvP risk increases during extraction.

If you’re not running a boosted loot condition, consider bringing a Hatch Key for safer exits.

Recommended Loadout for Testing Annex Runs

The Testing Annex is a medium-traffic building. Smart preparation increases survival odds.

Suggested Setup:

• Looting MK2 augment (extra safe pockets + trinket space)

• Light Shield kit for mobility

• Heals + grenades

• Jolt Mines or Explosive Mines

Why Bring Mines?

You’ll be looting enclosed rooms for an extended period. Placing a mine at the entrance:

• Alerts you if another raider enters.

• Provides defensive cover.

• Buys time to reposition.

If you’re missing key augments or equipment pieces, you can streamline preparation by choosing to Buy ARC Raiders Equipment instead of relying solely on random drops.

Where to Use the Dam Testing Annex Key

Location:

• Map: Dam Battlegrounds

• Building: Testing Annex

• Position: Southeast section of the map

Step-by-Step Route:

1. Approach from the western entrances.

2. Head upstairs after entering.

3. Close the door behind you.

4. Place a mine near the entrance.

5. Move forward (ignore the left staircase).

6. You’ll find the first locked door ahead.

The second locked room is located just to the right of the first door when facing outward.

What’s Inside the Locked Rooms?

Left Locked Door (Recommended First Choice)

This room generally contains:

• Lockers

• Medical bags

• Breachable cabinets

• Possible weapon cases

Loot potential includes:

• High-quality medical items (e.g., Vita Spray)

• Rare crafting components

• Commercial items

• Possible weapon drops

• Blueprint spawns

Because of the cabinet density and weapon case chance, this door often provides the higher overall value, especially during boosted map conditions.

If you’re specifically hunting rare crafting drops or blueprint unlocks, you may also consider options to Buy ARC Raiders Items (if applicable to your strategy) to reduce reliance on RNG-heavy loot cycles.

Right Locked Door (Secondary Option)

The right-side room contains:

• Tables and consoles with loose loot

• Drawers

• Trinkets

• Commercial sellables

While still valuable, the overall density and rarity potential typically feel slightly lower compared to the left room.

However, if:

• The first door appears recently looted

• You have two keys

• You’re running under Cold Snap or loot boost

Opening both rooms can be extremely profitable.

Which Door Should You Open?

If you only have one Dam Testing Annex Key, open the left locked door.

Reasons:

• Higher container density

• Better blueprint spawn potential

• More consistent medical and rare crafting loot

If you’re planning frequent runs, having multiple keys ensures maximum profit. Since key drops are random, many players prefer to Buy ARC Raiders Keys to guarantee access without waiting for lucky spawns.

Extraction Strategy: Don’t Throw the Run

The biggest mistake players make isn’t choosing the wrong door — it’s dying during extraction.

Smart Extraction Tips:

• Don’t overstay after securing high-tier loot.

• Listen for footsteps before leaving the building.

• Rotate unpredictably.

• Avoid obvious elevator rushes if multiple squads are active.

If you’re playing Solo, consider switching to Duos or Trios for key runs. Teammates can:

• Watch entrances

• Cover extraction

• Share defensive responsibility

The trade-off is splitting loot, but survival odds increase significantly.

Is the Dam Testing Annex Key Worth It?

Yes — especially during boosted loot conditions.

Pros:

• Strong blueprint potential

• High-value medical/commercial loot

• Medium building traffic (not always heavily contested)

Cons:

• Only one room per key

• Extraction can be dangerous during certain conditions

• Risk increases in solo play

For players progressing toward advanced crafting stations or Scrappy upgrades, the Testing Annex is a valuable farming route when executed properly.

Quick Key Run Checklist

Before deploying:

✔ Bring mines
✔ Equip Looting MK2
✔ Check map condition
✔ Decide extraction route early
✔ Open left door if carrying one key

Executed correctly, the Dam Testing Annex Key can generate some of the most consistent medium-to-high-tier loot on Dam Battlegrounds.