The accident occurred on Thursday afternoon, something that Aftonbladet was the first to report on.
- What we know at the moment is that he was diving with a group and that some kind of accident happened.
A rescue operation was launched and he was taken by ambulance helicopter to hospital, says Per Fahlström, press spokesperson at the police.
But the man's life could not be saved.
The police have initiated a preliminary investigation into causing another person's death.
- We have done this to be able to seize the equipment and investigate what has happened, says Per Fahlström.
Relatives are notified.