Watch the video that shows when it explodes and watch Viktor Mattsson tell how he escaped for his life via the balcony.
Viktor Matsson lived in one of the apartments that was hit hard by the explosion.
His car, which was parked in the garage next to the building, captured the explosion on Övre Husargatan on film, something P4 Göteborg previously reported on.
- You can see the large steel door facing the garage, how it flies up, he says.
The film, which GT was the first to publish, has been an important part of the police's preliminary investigation.
Moved after the explosion
A year has passed since the explosion and residents of 40 apartments are still waiting to move home.
The apartment where Viktor Matsson lived is one of those that has not yet been restored.
However, he has chosen to get another permanent residence and will not move back to Övre Husargatan.
He says that the incident has made him see life in a new way.
- I was absolutely sure I was going to die, he says.