What to know
- Ferrium bottles and Jet Drones are mandatory to progress through this quest
- Red fan mechanisms act as environmental gates, not optional interactions
- Several areas loop vertically, so backtracking is intentional, not a mistake
- Missing a single fan interaction can block access to an entire key path
Arknights Endfield leans heavily into environmental problem-solving, and Treasure Beneath Pond is one of the clearest examples of how the game blends traversal tools with layered level design. Unlike combat-focused objectives, this quest tests your awareness of space, elevation, and interaction order. The goal is simple on paper—find the keys to activate gate mechanisms—but the execution demands patience and careful use of resources.
This guide explains the quest in a clean, linear flow, clarifies why each step matters, and helps you understand how the red fan system, water spraying, and temporary platforms work together. If you rush or skip interactions, it’s easy to feel lost, so treating the space as a connected puzzle rather than isolated rooms is key.
Quick overview of Treasure Beneath Pond
| Detail | Information |
|---|---|
| Quest name | Treasure Beneath Pond |
| Objective | Find all keys to activate gate mechanisms |
| Required tools | Ferrium bottles, Jet Drone |
| Core mechanics | Red fans, water spraying, moving platforms |
| Area type | Cave system with vertical layers |
| Total keys | 3 |
Understanding the red fan and water mechanics
Before stepping through the cave, it’s important to understand what the quest is teaching you. Red fan mechanisms are reactive environmental devices. When sprayed with water using Ferrium bottles, they either unlock doors, activate platforms, or extend traversal paths. Jet Drones are used to interact with distant mechanisms or access sealed areas without committing your character to unsafe terrain.
The quest deliberately places extra Ferrium bottles along the route. This means you are not punished for entering underprepared, but you are expected to notice supply opportunities and restock when possible.
How to get all 3 keys for Activating the Gate in Treasure Beneath the Pond
Finding the First Key
Step 1: Locate the red fan mechanism and use the Jet Drone to open the door
At the pond-side entrance, you’ll spot a red fan mechanism positioned behind a sealed door. Deploy your Jet Drone to interact with the control point and open access to the cave area. This interaction establishes the dual-tool requirement that persists throughout the quest.
Step 2: Move inside the cave and collect Ferrium bottles from crates
Once inside, proceed cautiously and locate a wooden shed near the first chamber. Destroy it to reveal crates containing additional Ferrium bottles. Even if you arrived with your own supply, collecting these is strongly recommended, as the quest requires repeated spraying.
Step 3: Find the second red fan and spray it with water
Deeper into the cave, you’ll encounter another red fan mechanism guarding a closed door. Use Ferrium bottles to spray it. The door unlocks immediately, signaling successful interaction.
In the next area, keep advancing while actively scanning for red fans. You’ll find two more fans positioned to control access points within the cave. Spray both to fully open the route forward.
Step 5: Enter the newly unlocked area and collect the first key
With the doors open, move inside the next chamber. The first key is placed prominently here, confirming you’re on the correct progression path.
Finding second key
Step 6: Spray the fan near the first key to open another door
Near the location of the first key, you’ll notice yet another red fan. Spray it to unlock a side passage that leads upward.
Step 7: Climb to the upper levels using the staircase
Follow the newly opened route and ascend the staircase leading to higher ground. This marks the transition into the quest’s vertical section, where elevation becomes just as important as direction.
On your way upwards you will find the Wooden shed, which is a way to the third key. If you want you can detour here and grab the third key from here, as the order does not matter.
Step 8: Locate the next red fan and spray it
At the upper level, identify the next red fan mechanism and spray it with water. This interaction unlocks another enclosed space ahead.
Step 9: Enter and spray the fan on the left side of the entrance
Inside this area, turn left immediately to find a red fan positioned near the entrance wall. Spraying this fan is mandatory, as it unlocks access to the final structure containing the next key.
Step 10: Destroy the wooden shed to obtain the second key
Proceed inside and locate a wooden shed. Destroy it to reveal the second key, hidden deliberately to ensure players understand that destructible objects are part of puzzle progression.
Finding the third key
Step 11: Exit the area and descend one level to find another wooden shed
Leave the upper section and move one level below. Here, you’ll find another wooden shed blocking progress. Destroying it opens the route to the final area.
Step 12: Spray the red fan to activate the platform and cross over
In the next chamber, locate the red fan controlling a temporary platform. Spray it with water to activate the platform and safely cross to the opposite side.
Step 13: Retrieve the final key
On the far side of the platform, the final key awaits. Collecting it completes the objective required to activate all gate mechanisms tied to the Treasure Beneath Pond quest.
Stock or save Ferrium Bottles in the run
This quest quietly reinforces some of Endfield’s most important design principles. You are taught to observe before acting, to reuse tools efficiently, and to understand that progression is often layered rather than linear. The repeated use of red fans ensures that you internalize how water-based interactions shape the environment.
By the time you secure the final key, you’ve navigated horizontal tunnels, vertical staircases, destructible structures, and temporary platforms—all without the quest ever explicitly explaining these systems.
Activating the gate mechanisms beneath the pond
Treasure Beneath Pond rewards players who slow down and read the environment. If you treat each red fan as a conversation with the level design, the puzzle flows naturally from one area to the next. With careful Ferrium management and deliberate Jet Drone use, the quest becomes less about trial and error and more about understanding how Arknights: Endfield wants you to think.
Once completed, you’ll find later environmental puzzles far more intuitive, making this quest a subtle but essential milestone in your Endfield journey.
