In Hell is Us, the **Algae Key** serves as a vital exploration item tied to the **Lost Keys mystery**. Resembling a corroded set of algae-encrusted keys, it unlocks a pivotal lockbox later in the game. Below, we break down how to acquire and utilize this item.

How to Obtain the Algae Key

• Travel to **Lake Cynon** and locate the reservoir.
• Use the **Gear Spindle** to drain the water from the reservoir.
• Search the now-exposed lakebed to retrieve the Algae Key.

How to Use the Algae Key

• Head to **Samo’s General Store** in Marastan.
• Access the backroom and use the key to unlock **Samo’s Lockbox**.
• Inside, you’ll find **Cap-Terror**, which also resolves the Lost Keys mystery.

FAQ

Where is the Algae Key located?

It’s found in Lake Cynon’s reservoir after draining the water with the Gear Spindle.

What does the Algae Key unlock?

It grants access to Samo’s Lockbox in Marastan.

What reward comes from using the Algae Key?

You’ll obtain Cap-Terror and complete the Lost Keys mystery.

Is the Algae Key linked to a specific mystery?

Yes—it’s directly tied to the Lost Keys questline.

Can you miss the Algae Key?

Yes, if you progress past Lake Cynon without draining the reservoir.