Double cable breaks between Sweden and Estonia

Energy & Infrastructure AttacksCritical Infrastructure SabotageUndersea cables

Unclassified

Summary

Two fiber optic cable breaks between Sweden and Estonia occurred on December 31, 2025, causing no impact on Swedish internet according to authorities.

On the afternoon of December 31, 2025, two fiber optic cables linking Sweden and Estonia suffered breaks detected by the Swedish Post and Telecom Authority (PTS). The breaks happened in parallel but did not impact Swedish internet connectivity. Anders Wallinder from PTS characterized the incidents as serious but short-lasting. The cables belong to a Swedish telecom operator, and no evidence of sabotage or external interference has been identified. The incidents raise concerns about Baltic Sea telecommunications vulnerability, though official statements do not confirm hostile actions. The event highlights the sensitivity of undersea infrastructure linking Nordic and Baltic countries.

Classification

Confidence: High

The article reports two breaks in undersea fiber optic cables between Sweden and Estonia, describes the incidents as serious but short-lived, and explicitly states no impact on Swedish internet or evidence of sabotage or hostile actions. No actor is identified, and no attribution to aggression or defense measures is made, so this is classified as non-aggressive infrastructure failure or incident with high confidence.

Source URL

https://sverigesradio.se/artikel/dubbla-kabelbrott-mellan-sverige-och-estland

Open source

Provenance

Publisher: extension
Submitted: Feb 1, 2026, 00:14 UTC
Last updated: Nov 8, 2026, 23:47 UTC
Event time: Dec 31, 2025, 15:10 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": "6454cc2b-2ca1-4116-be24-c483679e705b",
  "url": "https://sverigesradio.se/artikel/dubbla-kabelbrott-mellan-sverige-och-estland",
  "source": "extension",
  "status": "approved",
  "category": "Energy & Infrastructure Attacks",
  "subcategory": "Critical Infrastructure Sabotage",
  "incident_type": "Undersea cables",
  "country": "Sweden",
  "source_reliability": "C",
  "info_credibility": "3",
  "tags": [
    "cables",
    "Sweden",
    "Estonia",
    "Baltic Sea",
    "Sabotage",
    "fiber optic cable",
    "undersea cable",
    "Sweden-Estonia",
    "infrastructure sabotage",
    "telecommunications",
    "PTS",
    "cyber-physical security"
  ],
  "nodes": [
    "Node 1: Borders"
  ],
  "countries": [],
  "where_text": "Undersea",
  "headline": "Double cable breaks between Sweden and Estonia",
  "description": "On December 31, 2025, two breaks in fiber optic cables between Sweden and Estonia were detected. The breaks occurred simultaneously but did not affect Swedish internet. These events were reported by the Swedish Post and Telecom Authority (PTS). According to the authority, the cables are operated by a Swedish company. Anders Wallinder, head of the department for preparedness and security at PTS, described the breaks as serious but short-lived incidents. There were no immediate indications of Russian involvement or sabotage.",
  "summary_short": "Two fiber optic cable breaks between Sweden and Estonia occurred on December 31, 2025, causing no impact on Swedish internet according to authorities.",
  "summary_extended": "On the afternoon of December 31, 2025, two fiber optic cables linking Sweden and Estonia suffered breaks detected by the Swedish Post and Telecom Authority (PTS). The breaks happened in parallel but did not impact Swedish internet connectivity. Anders Wallinder from PTS characterized the incidents as serious but short-lasting. The cables belong to a Swedish telecom operator, and no evidence of sabotage or external interference has been identified. The incidents raise concerns about Baltic Sea telecommunications vulnerability, though official statements do not confirm hostile actions. The event highlights the sensitivity of undersea infrastructure linking Nordic and Baltic countries.",
  "actor_primary": "Undersea fiber optic cables linking Sweden and Estonia",
  "target_primary": null,
  "location_text": "Undersea cable between Sweden and Estonia",
  "location_region": null,
  "location_coordinates_lat": 60.128161,
  "location_coordinates_lon": 18.643501,
  "location_precision": "Approximate",
  "is_aggressor_signal": false,
  "signal_type": "HYBRID_SIGNAL",
  "is_hybrid_war_signal": false,
  "classification_complete": true,
  "hybrid_signal_complete": true,
  "classification_confidence": "High",
  "classification_rationale": "The article reports two breaks in undersea fiber optic cables between Sweden and Estonia, describes the incidents as serious but short-lived, and explicitly states no impact on Swedish internet or evidence of sabotage or hostile actions. No actor is identified, and no attribution to aggression or defense measures is made, so this is classified as non-aggressive infrastructure failure or incident with high confidence.",
  "event_time_utc": "2025-12-31T15:10:00.000Z",
  "end_time_utc": null,
  "event_time_confidence": "pm6h",
  "created_at": "2026-02-01T00:14:34.932Z",
  "updated_at": "2026-11-08T23:47:11.271Z",
  "reliability_band": "strong",
  "location_precision_band": "approximate",
  "time_precision_band": "within_6h",
  "severity_band": "minor",
  "attribution_confidence_band": "high",
  "attribution_basis": "single_source"
}

Public assessmentReliability: StrongSeverity: MinorAttribution: HighSingle sourceTime: Within 6 hoursLocation: Approximate

Source reliability

Info credibility

Event time

Dec 31, 2025, 15:10 UTC

Event time confidence

pm6h

Location

Undersea cable between Sweden and Estonia

Primary actor

Undersea fiber optic cables linking Sweden and Estonia

Country

Sweden

Tags

cables, Sweden, Estonia, Baltic Sea, Sabotage, fiber optic cable, undersea cable, Sweden-Estonia, infrastructure sabotage, telecommunications, PTS, cyber-physical security

Nodes

Node 1: Borders

Loading signal...

{ "id": "6454cc2b-2ca1-4116-be24-c483679e705b", "url": "https://sverigesradio.se/artikel/dubbla-kabelbrott-mellan-sverige-och-estland", "source": "extension", "status": "approved", "category": "Energy & Infrastructure Attacks", "subcategory": "Critical Infrastructure Sabotage", "incident_type": "Undersea cables", "country": "Sweden", "source_reliability": "C", "info_credibility": "3", "tags": [ "cables", "Sweden", "Estonia", "Baltic Sea", "Sabotage", "fiber optic cable", "undersea cable", "Sweden-Estonia", "infrastructure sabotage", "telecommunications", "PTS", "cyber-physical security" ], "nodes": [ "Node 1: Borders" ], "countries": [], "where_text": "Undersea", "headline": "Double cable breaks between Sweden and Estonia", "description": "On December 31, 2025, two breaks in fiber optic cables between Sweden and Estonia were detected. The breaks occurred simultaneously but did not affect Swedish internet. These events were reported by the Swedish Post and Telecom Authority (PTS). According to the authority, the cables are operated by a Swedish company. Anders Wallinder, head of the department for preparedness and security at PTS, described the breaks as serious but short-lived incidents. There were no immediate indications of Russian involvement or sabotage.", "summary_short": "Two fiber optic cable breaks between Sweden and Estonia occurred on December 31, 2025, causing no impact on Swedish internet according to authorities.", "summary_extended": "On the afternoon of December 31, 2025, two fiber optic cables linking Sweden and Estonia suffered breaks detected by the Swedish Post and Telecom Authority (PTS). The breaks happened in parallel but did not impact Swedish internet connectivity. Anders Wallinder from PTS characterized the incidents as serious but short-lasting. The cables belong to a Swedish telecom operator, and no evidence of sabotage or external interference has been identified. The incidents raise concerns about Baltic Sea telecommunications vulnerability, though official statements do not confirm hostile actions. The event highlights the sensitivity of undersea infrastructure linking Nordic and Baltic countries.", "actor_primary": "Undersea fiber optic cables linking Sweden and Estonia", "target_primary": null, "location_text": "Undersea cable between Sweden and Estonia", "location_region": null, "location_coordinates_lat": 60.128161, "location_coordinates_lon": 18.643501, "location_precision": "Approximate", "is_aggressor_signal": false, "signal_type": "HYBRID_SIGNAL", "is_hybrid_war_signal": false, "classification_complete": true, "hybrid_signal_complete": true, "classification_confidence": "High", "classification_rationale": "The article reports two breaks in undersea fiber optic cables between Sweden and Estonia, describes the incidents as serious but short-lived, and explicitly states no impact on Swedish internet or evidence of sabotage or hostile actions. No actor is identified, and no attribution to aggression or defense measures is made, so this is classified as non-aggressive infrastructure failure or incident with high confidence.", "event_time_utc": "2025-12-31T15:10:00.000Z", "end_time_utc": null, "event_time_confidence": "pm6h", "created_at": "2026-02-01T00:14:34.932Z", "updated_at": "2026-11-08T23:47:11.271Z", "reliability_band": "strong", "location_precision_band": "approximate", "time_precision_band": "within_6h", "severity_band": "minor", "attribution_confidence_band": "high", "attribution_basis": "single_source" }