Finland's Supo Dismisses Russian Sabotage Theory Behind Baltic Cable Damage, Points to Mundane Causes

• Supo, Finland's security police, says Baltic cable incidents are not Russian sabotage — the causes are mundane
• Politicians and media across the Nordic countries have spent years implying or asserting Russian responsibility
• Finland shares a 1,340 km border with Russia and has no institutional reason to downplay genuine threats
• The dismissal raises questions about billions earmarked for Baltic infrastructure protection against alleged hybrid warfare

Finland's Security Intelligence Service, Supo (Suojelupoliisi), has dismissed the theory that Russia is behind the repeated undersea cable damage incidents in the Baltic Sea over recent years. As Samnytt reports, Supo characterises the actual causes as considerably more mundane than the picture painted by politicians and media across the region — pointing instead to routine maritime hazards such as ship anchors dragging across the seabed, fishing vessel equipment, and ordinary wear on subsea infrastructure.

The statement carries weight precisely because of its source. Finland shares a 1,340-kilometre land border with Russia, maintains one of the most capable military intelligence apparatuses in Europe, and has spent decades calibrating its threat assessments against Moscow with a sobriety born of geography and history. If any Nordic intelligence service had reason to sound the alarm on Russian hybrid operations in the Baltic, it would be Supo. Instead, Supo is telling the public to calm down.

That puts the Finnish assessment in direct tension with the political consensus that has hardened across the Nordic and Baltic states since the first high-profile cable incidents. When the Balticconnector gas pipeline and a telecommunications cable were damaged in October 2023, Finnish and Estonian officials initially signalled possible sabotage before the investigation traced the damage to the anchor of the Hong Kong-flagged vessel Newnew Polar Bear. A similar pattern repeated with other incidents: dramatic initial framing, followed by quieter corrections. Swedish, Danish, and Estonian politicians have all used cable damage episodes to argue for expanded naval patrols, new surveillance systems, and billions in spending on Baltic seabed infrastructure protection. NATO has announced dedicated efforts to protect undersea cables, framing the issue as a frontline of hybrid warfare.

Supo's assessment raises an uncomfortable question: how much of the political and media response was driven by genuine intelligence, and how much by the strategic convenience of a Russian sabotage narrative? The cable incidents arrived at a moment when Nordic governments needed to justify rapidly increasing defence budgets and NATO integration to sceptical publics. A shadowy Russian threat to critical infrastructure made a compelling case. Each incident generated headlines about "hybrid warfare" and "grey zone attacks," language that entered the political vocabulary with remarkable speed and remarkably little scrutiny.

None of this means Russia poses no threat to Baltic infrastructure — Moscow has demonstrated both capability and willingness to operate aggressively in the region. But there is a difference between maintaining vigilance and constructing a narrative that attributes every scraped cable to the Kremlin. The former is intelligence work. The latter is politics.

The billions now being allocated to Baltic seabed surveillance and protection programmes were justified largely on the premise that these cables face deliberate, state-sponsored attack. If the most credible Nordic intelligence assessment says the damage is caused by anchors and fishing gear, the spending case looks rather different. Protecting infrastructure against routine maritime accidents is an engineering problem with engineering solutions — heavier cable armouring, better routing, clearer exclusion zones — not a military problem requiring naval task forces.

Finland's intelligence service has, in effect, told the Nordic public that the emperor's hybrid warfare wardrobe is thinner than advertised. The cable protection budgets, however, are already moving through parliaments.

Sources: Samnytt