Police Investigate Damage to Telecommunications Cable in Gulf of Finland

Energy & Infrastructure AttacksCritical Infrastructure SabotageUndersea cables

Aggressor

Summary

On 31 December 2025, Finnish authorities investigated damage to a telecommunications cable between Helsinki and Tallinn caused by a vessel in the Gulf of Finland, treating the case as aggravated criminal damage and interference with telecommunications.

Early on 31 December 2025, Elisa detected a fault in its telecommunications cable between Helsinki and Tallinn, located within Estonia's exclusive economic zone. The Finnish Border Guard identified and intercepted a vessel with a lowered anchor chain within Finland's exclusive economic zone suspected of causing the damage. The vessel was ordered to raise its anchor and move to a safe anchorage, subsequently taken under Finnish control. Investigation responsibility was transferred to the Helsinki Police Department. The police, in coordination with the National Prosecutor's Office and Prosecutor General, are investigating the event as aggravated criminal damage, attempted aggravated criminal damage, and aggravated interference with telecommunications. The investigation involves several authorities including the Finnish Defence Forces, Customs, Traficom, Tukes, and Finngrid. Further details are pending.

Classification

Confidence: High

The event describes hostile damage to critical underwater telecommunications infrastructure by a vessel, with Finnish authorities identifying and detaining the suspect vessel and launching a criminal investigation for aggravated damage. This matches aggressor activity under Energy & Infrastructure Attacks. There is no indication of defensive preparations.

Source URL

https://poliisi.fi/en/-/police-investigate-cable-damage-in-the-gulf-of-finland-in-cooperation-with-other-authorities

Open source

Provenance

Publisher: extension
Submitted: Feb 14, 2026, 12:22 UTC
Last updated: Nov 4, 2026, 08:36 UTC
Event time: Dec 31, 2025, 00:00 UTC

Published as a hybrid-warfare signal with a public source and reviewer-approved assessment bands. See the methodology for how records are assessed.

Raw record

{
  "id": "902106aa-e43c-4feb-b615-6378feef7153",
  "url": "https://poliisi.fi/en/-/police-investigate-cable-damage-in-the-gulf-of-finland-in-cooperation-with-other-authorities",
  "source": "extension",
  "status": "approved",
  "category": "Energy & Infrastructure Attacks",
  "subcategory": "Critical Infrastructure Sabotage",
  "incident_type": "Undersea cables",
  "country": "Finland",
  "source_reliability": "A",
  "info_credibility": "2",
  "tags": [
    "undersea cable damage",
    "telecommunications sabotage",
    "Gulf of Finland",
    "Finland",
    "Estonia",
    "critical infrastructure",
    "border guard",
    "police investigation",
    "anchor chain",
    "aggravated criminal damage"
  ],
  "nodes": [
    "Node 1: Borders"
  ],
  "countries": [
    "Finland"
  ],
  "where_text": "Undersea",
  "headline": "Police Investigate Damage to Telecommunications Cable in Gulf of Finland",
  "description": "On 31 December 2025, telecommunications provider Elisa detected damage to its underwater telecommunications cable between Helsinki and Tallinn. The damage site was located within Estonia's exclusive economic zone. Finland's Border Guard found a vessel suspected of causing the damage within Finland's exclusive economic zone with its anchor chain lowered into the sea. Finnish authorities took control of the vessel and transferred the investigation leadership to Helsinki Police Department. The police are investigating the incident as aggravated criminal damage, attempted aggravated criminal damage, and aggravated interference with telecommunications, cooperating with multiple national and international authorities.",
  "summary_short": "On 31 December 2025, Finnish authorities investigated damage to a telecommunications cable between Helsinki and Tallinn caused by a vessel in the Gulf of Finland, treating the case as aggravated criminal damage and interference with telecommunications.",
  "summary_extended": "Early on 31 December 2025, Elisa detected a fault in its telecommunications cable between Helsinki and Tallinn, located within Estonia's exclusive economic zone. The Finnish Border Guard identified and intercepted a vessel with a lowered anchor chain within Finland's exclusive economic zone suspected of causing the damage. The vessel was ordered to raise its anchor and move to a safe anchorage, subsequently taken under Finnish control. Investigation responsibility was transferred to the Helsinki Police Department. The police, in coordination with the National Prosecutor's Office and Prosecutor General, are investigating the event as aggravated criminal damage, attempted aggravated criminal damage, and aggravated interference with telecommunications. The investigation involves several authorities including the Finnish Defence Forces, Customs, Traficom, Tukes, and Finngrid. Further details are pending.",
  "actor_primary": "Finnish Border Guard",
  "target_primary": null,
  "location_text": "Gulf of Finland, Finland/Estonia Exclusive Economic Zones",
  "location_region": null,
  "location_coordinates_lat": 59.5,
  "location_coordinates_lon": 25,
  "location_precision": "Approximate",
  "is_aggressor_signal": true,
  "signal_type": "HYBRID_SIGNAL",
  "is_hybrid_war_signal": true,
  "classification_complete": true,
  "hybrid_signal_complete": true,
  "classification_confidence": "High",
  "classification_rationale": "The event describes hostile damage to critical underwater telecommunications infrastructure by a vessel, with Finnish authorities identifying and detaining the suspect vessel and launching a criminal investigation for aggravated damage. This matches aggressor activity under Energy & Infrastructure Attacks. There is no indication of defensive preparations.",
  "event_time_utc": "2025-12-31T00:00:00.000Z",
  "end_time_utc": null,
  "event_time_confidence": "unknown",
  "created_at": "2026-02-14T12:22:52.739Z",
  "updated_at": "2026-11-04T08:36:03.522Z",
  "reliability_band": "strong",
  "location_precision_band": "approximate",
  "time_precision_band": "unknown",
  "severity_band": "moderate",
  "attribution_confidence_band": "high",
  "attribution_basis": "single_source"
}

Public assessmentReliability: StrongSeverity: ModerateAttribution: HighSingle sourceTime: UnknownLocation: Approximate

Source reliability

Info credibility

Event time

Dec 31, 2025, 00:00 UTC

Event time confidence

unknown

Location

Gulf of Finland, Finland/Estonia Exclusive Economic Zones

Primary actor

Finnish Border Guard

Country

Finland

Countries

Finland

Tags

undersea cable damage, telecommunications sabotage, Gulf of Finland, Finland, Estonia, critical infrastructure, border guard, police investigation, anchor chain, aggravated criminal damage

Nodes

Node 1: Borders

Loading signal...

{ "id": "902106aa-e43c-4feb-b615-6378feef7153", "url": "https://poliisi.fi/en/-/police-investigate-cable-damage-in-the-gulf-of-finland-in-cooperation-with-other-authorities", "source": "extension", "status": "approved", "category": "Energy & Infrastructure Attacks", "subcategory": "Critical Infrastructure Sabotage", "incident_type": "Undersea cables", "country": "Finland", "source_reliability": "A", "info_credibility": "2", "tags": [ "undersea cable damage", "telecommunications sabotage", "Gulf of Finland", "Finland", "Estonia", "critical infrastructure", "border guard", "police investigation", "anchor chain", "aggravated criminal damage" ], "nodes": [ "Node 1: Borders" ], "countries": [ "Finland" ], "where_text": "Undersea", "headline": "Police Investigate Damage to Telecommunications Cable in Gulf of Finland", "description": "On 31 December 2025, telecommunications provider Elisa detected damage to its underwater telecommunications cable between Helsinki and Tallinn. The damage site was located within Estonia's exclusive economic zone. Finland's Border Guard found a vessel suspected of causing the damage within Finland's exclusive economic zone with its anchor chain lowered into the sea. Finnish authorities took control of the vessel and transferred the investigation leadership to Helsinki Police Department. The police are investigating the incident as aggravated criminal damage, attempted aggravated criminal damage, and aggravated interference with telecommunications, cooperating with multiple national and international authorities.", "summary_short": "On 31 December 2025, Finnish authorities investigated damage to a telecommunications cable between Helsinki and Tallinn caused by a vessel in the Gulf of Finland, treating the case as aggravated criminal damage and interference with telecommunications.", "summary_extended": "Early on 31 December 2025, Elisa detected a fault in its telecommunications cable between Helsinki and Tallinn, located within Estonia's exclusive economic zone. The Finnish Border Guard identified and intercepted a vessel with a lowered anchor chain within Finland's exclusive economic zone suspected of causing the damage. The vessel was ordered to raise its anchor and move to a safe anchorage, subsequently taken under Finnish control. Investigation responsibility was transferred to the Helsinki Police Department. The police, in coordination with the National Prosecutor's Office and Prosecutor General, are investigating the event as aggravated criminal damage, attempted aggravated criminal damage, and aggravated interference with telecommunications. The investigation involves several authorities including the Finnish Defence Forces, Customs, Traficom, Tukes, and Finngrid. Further details are pending.", "actor_primary": "Finnish Border Guard", "target_primary": null, "location_text": "Gulf of Finland, Finland/Estonia Exclusive Economic Zones", "location_region": null, "location_coordinates_lat": 59.5, "location_coordinates_lon": 25, "location_precision": "Approximate", "is_aggressor_signal": true, "signal_type": "HYBRID_SIGNAL", "is_hybrid_war_signal": true, "classification_complete": true, "hybrid_signal_complete": true, "classification_confidence": "High", "classification_rationale": "The event describes hostile damage to critical underwater telecommunications infrastructure by a vessel, with Finnish authorities identifying and detaining the suspect vessel and launching a criminal investigation for aggravated damage. This matches aggressor activity under Energy & Infrastructure Attacks. There is no indication of defensive preparations.", "event_time_utc": "2025-12-31T00:00:00.000Z", "end_time_utc": null, "event_time_confidence": "unknown", "created_at": "2026-02-14T12:22:52.739Z", "updated_at": "2026-11-04T08:36:03.522Z", "reliability_band": "strong", "location_precision_band": "approximate", "time_precision_band": "unknown", "severity_band": "moderate", "attribution_confidence_band": "high", "attribution_basis": "single_source" }