Swedish newspaper Svenska Dagbladet can reveal sensational information about what happened before and during the ongoing marine search operation in the archipelago of Stockholm, where the Swedish Armed Forces – in their own words – are searching for ”suspected foreign activity under water”.

In the official version the operation started due to the reports from a ”credible source” that had seen a suspicious object on friday.

But what has not been revealed is that the National Defence Radio Establishment (Försvarets radioanstalt, FRA) detected radio communication in Russian a day before the operation started. It was transmitted on a special frequence, used by Russia in emergency situations.

About 14 hours later, Friday the 17th october around noon, the underwater vehicle was detected and the search operation begun.

Friday night signal intelligence once again intercepted radio communication. This time it was encrypted but it was possible to determine the position of the transmitter and the receiver. The transmitter was situated somewhere in Kanholmsfjärden in the archipelago of Stockholm, and the receiver was situated in Kaliningrad, Russia.

This information has been confirmed by several persons with knowledge about the ongoing search operation, altough they can't confirm that there is a damaged submarine in Swedish waters.

– We are now focusing on determining if there is ongoing foreign underwater activity or not, one of the sources tells Svenska Dagbladet.

The swedish armed forces said Sunday – after a couple of days of almost complete silecence about the operation – that they now see it as "very likely" that foreign activity under water is taking place in the archipelago of Stockholm. On a press conference they said they have recieved three testimonys since Friday from eyewitnesses that have made similar observations of something showing at the surface in three different places in the archipelago.

They also showed a picture of the latest observation, taking place on Sunday, that shows a black object coming up from the water – altough far away from where the picture is taken.

At the same press conference the Swedish armed forces rejected that they had recieved information about any emergency call in Russian. But they did not want to comment on the information about radio communication between Kanholmsfjärden and Kaliningrad.

Translation: Mattias Mächs.