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auonsson
@auonsson.bsky.social
Every system is a sensor if you hold it right.

Main arena, Baltics. 🇸🇪

mastodon.world/@auonsson , x.com/auonsson backup 🇸🇪
Steel plant SSAB Oxelösund mid Sweden has suffered a 'large explosion'.

Cause unknown, no souls hurt, smaller fires reported.

The plant produces ~4k ton steel a day and is among Sweden's largest industries.

www.sverigesradio.se/artikel/expl...
November 21, 2025 at 10:07 PM
November 17, 2025 at 9:33 AM
The railway Warsaw - Lublin has been attacked with both explosives and sabotage.

"unprecedented act of sabotage targeting directly the security of the Polish state and its civilians. This route is also crucially important for delivering aid to Ukraine" says Polish PM Donald Tusk.
November 17, 2025 at 9:33 AM
AIS-spoof-station WHISKEY 365 in Finland is offline.

It operated with a noteworthy 100% uptime for over a year. Oct 30 it started publishing anomalous data and caused a mass spoof event Nov 2.

Now offline since a few hours.

Guess: they were raided by FI authorities.
November 11, 2025 at 7:54 AM
AIS-spoof-station WHISKEY 365 in Finland is offline.

It operated with a noteworthy 100% uptime for over a year, til it started publishing anomalous data Oct 30 and caused a mass spoof event Nov 2.

Guess: they were raided by FI authorities.
November 11, 2025 at 7:53 AM
The anomalous data streams are also apparent in the plots from Marinetraffic. Station streams to both MT and Vesselfinder.
November 9, 2025 at 11:49 PM
The AIS-receiver station responsible for the mass spoof event Nov 2 in Baltic Sea show anomalous data patterns during 8 more days but returned to normalcy Nov 9.

From a baseline of ~30 ships/h, for 8 days it reported 56-113 ships/h.

Speculation: Mass spoof might have been a mistake by attacker.
November 9, 2025 at 11:49 PM
November 5, 2025 at 2:46 PM
Nov 2 Russian subsea sabotage/intel vessel YANTAR was allegedly operating just off the Netherland coast, among a good chunk of European critical infrastructure.

The ship is specialized in subsea missions and ran by highly secretive GUGI, Main Directorate of Deep-Sea Research.
November 5, 2025 at 2:46 PM
Agreed, culprit in this case: www.marinetraffic.com/en/ais/detai...

So many easy filters to avoid this, none implemented. Nb, log scale.
November 3, 2025 at 9:20 AM
Today at 1109Z what looks like a mass spoof event of AIS-signal took place in central Baltic Sea.

In an area from approximately Bornholm to mid Gulf of Finland hundreds (thousands?) of new AIS-messages suddenly appeared. A large part of them military ships.
November 2, 2025 at 8:47 PM
Last year YANTAR used her AIS to publish a scare to the Irish people and armed forces when she pinged a few messages on top of their main energy infrastructure, just inside Irish exclusive economic zone (international waters.)
November 2, 2025 at 6:29 PM
Russian ship YANTAR, specialized in underwater missions of sabotage/intelligence/engineering/research has made one ping in the Baltic Sea today. Last seen on AIS by Skagen, Denmark in Jan 2025

Operated by Main Directorate of Underwater Research (GUGI)

Likely a stunt, like 2024
November 2, 2025 at 6:29 PM
The DGPS-stations of Skagen and Hammer Odde are unreliable, states 2 NAVTEX from today.

DGPS is supplementary to GPS and is used to correct.

As should be obvious from map these are strategic locations.

Previous instances have sometimes coincided with more ship jamming.
October 13, 2025 at 9:17 PM
If I understand the post by @jjdroxford.bsky.social correct, the routine of warning other forces for S102B SigInt is new.
October 12, 2025 at 7:36 PM
Russian air defence is keeping track of when Swedish signals intelligence aircraft S102B Korpen take off from Malmen, Sweden and Russian forces are notified and warned.

Other SIGINT aircraft does not seem to cause this warning to be sent.

Go Sweden!
October 12, 2025 at 7:36 PM
Map of area in question. An Estonian road runs through Russia for less than a kilometer.

This road saw troop movements dire enough to cause Estonian police/border guard to close the border.
October 11, 2025 at 11:11 PM
Estonia has closed off a road/border passing through Russia after larger than usual groups of troops have been spotted.

Comment: I am hard pressed to find any insignia on those filmed and SE news claims "little green men".
October 11, 2025 at 11:11 PM
German Federal Office for Radiation Protection (BfS) held an exercise where they inadvertently published simulated radiation data to the live surveillance system.

This led to false high readings.

Point sensational posters to this post.
October 5, 2025 at 6:02 PM
Ambulances on south Sweden island Öland are reporting daily issues with their navigation systems, including spoofing and software that hangs.

These nowadays widespread sea level effects are puzzling. From known jammer locations one can not reach this far via line of sight. Space? Ship?
October 5, 2025 at 4:01 PM
Danish Homeguard guarding the approach of CPH Kastrup airport as Ukraine govt Airbus A319 goes in for a landing.
October 1, 2025 at 9:12 PM
Conspicious Russian trawler LAZURNY IMO 8729664 is passing Copenhagen and EU defence meeting. Ahead of her a Danish frigate with RIBs in water.

She started her journey from Kaliningrad, docks shared with the AKADEMIK(spy)-fleet and has moved without AIS til an hour ago.
October 1, 2025 at 6:42 PM
I feel you.
October 1, 2025 at 5:59 PM
Gotland is being armed.

Polish Navy landing ship ORP Toruń (825) travelled from military port of Gdynia to Visby, Gotland SE today. Stayed Visby port only 2 hours.

Ship is moving anti-ship missile systems to Gotland.

4th similar trip last 10 days. Operation Gotland Sentry.
September 30, 2025 at 9:15 PM
Canada is patrolling Sweden's west coast or the Baltic Sea entrance, dep on perspective.

Thanks Canada!
September 29, 2025 at 8:25 PM