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  1. Games
  2. Survival Games
  3. Atomfall

How to open the Forgotten Cellar door in Atomfall

Guides
By Ford James published 27 March 2025

How to get the Atomfall Forgotten Cellar key for the cellar in St. Katherine's Church

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The Forgotten Cellar door beneath St. Katherine's Church in Atomfall.
(Image credit: Rebellion)
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If you're wondering how to unlock the Forgotten Cellar in Atomfall, don't worry, you're definitely not the only one. Atomfall is full of locked doors that require various keys, and this church cellar door in Wyndham is no different. Located in the basement of St. Katherine's Church, where Vicar McHenry and Pamela Shaw can be found contemplating the murder, is this locked door, which some folks have claimed they can hear noises behind.

So where is the Church Cellar Key and how do you get into the Atomfall Forgotten Cellar? Here's everything you need to know, including what's behind the door.

Where to find the Atomfall Church Cellar Key

The Church Cellar Key on the floor in Medical in The Interchange in Atomfall.

(Image credit: Rebellion Developments / Future)

The short answer is that the Atomfall Church Cellar Key can be found inside the Medical facility within The Interchange. As you enter Medical, take a right-hand turn at the reception desk, then take another immediate right down a corridor with a bright light at the end and a brown rug on the floor. Next to the "Holder is Up To Something" audio log, you'll find the Church Cellar Key, which opens the Forgotten Cellar in St. Katherine's Church.

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To reach Medical in The Interchange however, you must enter via the Slatten Dale entrance to the building that is central to everything happening in Atomfall. Once you've restored power to Data Store Charlie, you can find the entrance to Medical between Data Store Alpha and Charlie, though you'll likely have some Ferals and/or Outlaws to kill along the way. Be careful once you're in Medical too, because the place is crawling with Thralls, one of the toughest enemies in the game.

Atomfall Forgotten Cellar explained

Speaking with Dr. Alan Holder in the Forgotten Cellar in Atomfall.

(Image credit: Rebellion Developments / Future)

When you have the Atomfall Church Cellar Key, you can return to Wyndham and unlock the door. What's behind it? Well, only one Dr. Alan Holder. The scientist is studying the effects of the spores and, as a result, possesses some impressively blue eyes. He tasks you with returning to Medical and acquiring Sample One, so he can continue studying and hopefully put an end to the quarantine.

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He also has the Experimental Inoculation available for you, which will grant you the Infection Resistance Skill, along with providing access to both Radiation Resistance and Healing Boost, which are considered two of the best Atomfall Skills to have. There are also four Training Stimulants to be found back here, so there's plenty of good stuff to be had.

Looking for more Atomfall help? Make sure you follow our guide on how to get the Atomfall Signal Redirector if you don't have one already, and our Atomfall tips cover a lot of info you might not know already.

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Ford James
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Freelance Writer

Give me a game and I will write every "how to" I possibly can or die trying. When I'm not knee-deep in a game to write guides on, you'll find me hurtling round the track in F1, flinging balls on my phone in Pokemon Go, pretending to know what I'm doing in Football Manager, or clicking on heads in Valorant.

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