Despite warnings, the attack on Nord Stream was for many a rude awakening. Now authorities and electricity companies are preparing for "seabed warfare" Most exposed is Gotland, which can be completely without power for a long period in the event of an attack similar to the one directed at the gas pipelines.

There has been no shortage of warnings about the vulnerability of pipelines and cables on the seabed. Just last week, Navy Chief Ewa Skoog Haslum told reporters that they are convinced that Russia has mapped underwater infrastructure.