Atomfall's best ending is only for the most attentive players. This is also the truly good one

When we play computer games, it's clear that many of us aim for the best possible ending, particularly if it's hidden. In most cases, however, achieving it is a difficult task, in which one wrong step will prevent us from having the "happy ending." This is roughly what the ending of Oubliette looks like in Atomfall.

The most favorable scenario for a post-apocalyptic Great Britain isn't impossible, but it's worth preparing for it properly.

How to have Oubliette ending?

Oubliette is considered the most secret ending of Atomfall, based on cooperation with Doctor Holder. Contrary to appearances, his request seems quite simple - the doctor wants to poison Oberon and thus permanently neutralize it. However, this is not something he will be able to do solo, so our help will be necessary.

1. Before any negotiations can take place, we need to find Holder. The scientist is in the basement of St. Katherine's Church, we will find the key in the medical station of The Interchange. During the first conversation, the doctor will explain his plan to us - due to the desired ending, cooperation is highly recommended.
2. Next, we need to return to the medical section to obtain the sample needed to poison Oberon. The required material can be found on the lower level, which we can access thanks to the entrance pass received from Holder. A mandatory point will also be the release of Dr. Garrow from prison, as she is a key element of the finale.
3. Having the necessary sample, we return to Dr. Holder. The man will ask us in the meantime about the fate of Dr. Garrow. Assuming that we politely let her out of the cell, she will return to The Interchange, where the final confrontation between her and Holder will take place. Our new ally avenges the disaster brought upon the team of scientists, and then hands us an already poisoned sample.
4. Now we face the most difficult moment: poisoning the Oberon. First, we need to head out to the vicinity of the excavation site to activate the fire protection systems (while also getting rid of a few opponents). The levers are located on both sides of the outpost.
5. Once we deal with the levers, we can place the poisoned sample in the system. The place to do so can be found to the left of the entrance to the control room, from which you just need to pull the right lever to kill Oberon.
6. In the end, we have to escape from the excavation site, with several enemies standing in our way, including Mother Jago. Doctor Holder is waiting for us in the medical tunnels under The Interchange, which we will access through the entrance from the Slatten Dale side. The signposts placed along the path will be helpful.

In the Oubliette ending, we escape with Doctor Holder through the tunnels hidden under the facility. As it turns out, poisoning Oberon was the only fully effective way to neutralize it, thus abandoning all attempts at experiments in the future.

Blowing up a facility linked to other endings would only isolate it from the rest of the world temporarily, but not entirely eradicate it. We can obtain this information if we choose the option to blow up Oberon instead of poisoning it. Then we can find the recording of Dr. Holder, in which he explains that our actions only delay the moment when someone will stumble upon it again.

Unfortunately, everything has its price. Due to the pathogens implanted in us, we both have to remain in hiding for some time. Otherwise, we could fall victim to the experiments ourselves. Nevertheless, this is the most positive ending, considering the future fate of the world.

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Atomfall

March 27, 2025

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