The most likely theory is that someone must have intentionally destroyed the pipes, says Kåberger.
- It is not unbelievable that it is some form of intentional damage precisely for the reason that there is more than one damage in more than one place.
We don't know what it is, he says.
- But an important lesson from this and things that have happened in connection with the Ukraine crisis is that this type of energy infrastructure with large energy flows is very vulnerable, continues Kåberger.
Hear the expert list more less likely but possible scenarios in the clip above.