Cables, NAVTEX and Naval Escorts: What the Great Sea Interconnector Dispute Reveals About Eastern Mediterranean Order

Why It Matters

The Great Sea Interconnector dispute matters because a planned Greece–Cyprus power cable is being surveyed in waters where the continental shelf between Greece, Cyprus, Türkiye and the Turkish Cypriots has not been delimited. Reports of a French research vessel and reportedly escorting French warships on 10 November 2026 bring a third state's naval presence into a question that international law has not settled.

The case shows how infrastructure, naval presence and unresolved jurisdiction now interact in a multipolar Eastern Mediterranean. This analysis does not declare a winner by assertion. It sets out the legal gaps first and then presents Ankara's case in the Türkiye's Position section.

Background

The Great Sea Interconnector (GSI) is a planned high-voltage electricity link intended to connect Crete with Cyprus and mainland Greece. Its promoters include the Greek and Cypriot state electricity bodies, and the European Union has recognized it as a Project of Common Interest under its energy-infrastructure framework. Critics and governments raise concerns about survey requirements, environmental impact and the maritime areas the route would cross.

The 10 November 2026 Reports

The following points are drawn from the news feed and attributed to their sources. Several remain unverified.

• Greek City Times reported that the French research vessel Abeille Marengo left Heraklion on 10 November 2026 to resume seabed surveys for the GSI.
• The same outlet reported that French naval vessels were deployed to escort the survey. We have not independently verified this, and the reporting gives no detail on vessel numbers or orders.
• Greek City Times also reported that Türkiye's Antalya NAVTEX station issued notice 1127/26, stating that the planned research had been coordinated with Turkish authorities and received their consent. We have not seen the text of the notice.
• Greece rejected this claim and says the project proceeds under permits issued by Greek and Cypriot authorities.
• TRT World reported that on 10 November Turkish Foreign Ministry spokesperson Öncü Keçeli welcomed progress on confidence-building after the 9 November trilateral meeting on the island between TRNC President Tufan Erhürman, the Greek Cypriot leader and the UN Secretary-General's personal envoy, and urged the Greek Cypriot Administration to change its stance.

Key Players & Positions

Greece and the Greek Cypriot Administration

Athens and the Republic of Cyprus, as reported, hold that the project is lawful and permitted, and that Turkish objections have no legal basis. Both states are parties to UNCLOS and rely on it together with customary law, including the view that coastal states' shelf rights exist without declaration and that islands generate maritime zones under Article 121.

France and the EU

France is the flag state of the Abeille Marengo. We have not found a French government statement on this specific escort in our sources, so the escort should be read as a reported deployment only. The EU treats the GSI as a Project of Common Interest in its energy-security policy. The EU has no competence to adjudicate maritime delimitation between member states and non-member states, a point Ankara stresses.

Türkiye, the TRNC and Turkish Cypriots

The Turkish Foreign Ministry, through spokesperson Öncü Keçeli, has urged the Greek Cypriot Administration to change its stance on the island. The TRNC and Turkish Cypriots, as co-founders of the Republic of Cyprus under the 1960 partnership framework, are stakeholders whose offshore rights Ankara says must be respected in any project in the area.

Does a NAVTEX Create Jurisdiction?

No. A NAVTEX is a coordinated navigational warning broadcast by national coastal stations to alert mariners to hazards, exercises or surveys. It can establish that a notice was issued and what mariners are advised to avoid, but it cannot create title to a maritime zone, settle delimitation or grant consent that a state lacks authority to give.

Both Greece and Türkiye have used competing NAVTEX notices in past disputes, including during the 2020 episode around the Oruç Reis survey vessel. The legal weight of notice 1127/26 therefore depends on underlying facts: whether any consent was actually given, by whom, and under what authority the area is governed.

What Does UNCLOS Article 79 Say About Cables?

Article 79 of the UN Convention on the Law of the Sea (UNCLOS) sets out three rules for submarine cables and pipelines on the continental shelf. Paragraph 1 entitles all states to lay submarine cables on the shelf of other states. Paragraph 2 bars the coastal state from impeding laying or maintenance, subject to reasonable measures for shelf exploration, resource exploitation and pollution prevention. Paragraph 3 makes the delineation of pipeline courses subject to the coastal state's consent.

The consent clause textually covers pipelines, not cables. Greece and Cyprus read Article 79 as giving the GSI the freedoms of paragraphs 1 and 2, with environmental and research permits as the remaining regulatory layer. Ankara, which is not a party to UNCLOS, argues that where the shelf is undelimited, the identity of the 'coastal state' is itself disputed, and that equity and coordination obligations apply.

The legal disagreement therefore turns on three questions: who the coastal state is in an undelimited area, which environmental and marine-research rules apply, and whether research permits issued by one party bind a area that another party claims. For the wider treaty framework on Articles 74, 83 and 121, see The Treaty Line.

Why Delimitation Is the Structural Gap

Articles 74 and 83 of UNCLOS require states with opposite or adjacent coasts to agree on an equitable solution for their exclusive economic zones and continental shelves. Türkiye, with an 870 km (approximately 540 mile) continental coastline, argues that islands cannot cut off the natural prolongation of a mainland coast, and that the principle of equity (hakkaniyet ilkesi) requires proportionality.

Türkiye registered the outer limits of its continental shelf with the United Nations on 18 March 2020. On 12 June 2025, it registered its 'Marine Spatial Planning of the Republic of Türkiye' with IOC-UNESCO, which Ankara presents as the first formal registration of its Black Sea, Aegean and Mediterranean position with a UN body. The Greek side disputes the relevance of that registration. No delimitation agreement between Greece and Türkiye covers the area in question.

For the broader context of energy routing and delimitation, see Eastern Mediterranean Gas for Europe: Why the Route Through Türkiye Keeps Returning to the Table.

What Are the Security and Diplomatic Implications of Naval Escorts?

A third-state escort of a survey ship can be read in two ways. Supporters would describe it as protection of a lawful activity against interference. Critics would see it as escalation that places a military presence over an undelimited zone. Neither reading requires that escalation is inevitable, and both sides have an interest in deconfliction channels that keep survey operations and warships apart.

Ankara's concern is that EU solidarity or a foreign naval presence might be treated as creating facts on the water that substitute for negotiation. For a wider view of Türkiye's place in a multipolar security order, see Türkiye in a Multipolar World: Strategic Autonomy, Alliances and Middle-Power Diplomacy and Arms Markets in a Multipolar Order: How Türkiye's Defense Exports Reshape Alliances.

How Does the Cyprus Track Connect to Maritime Infrastructure?

The Cyprus track is directly relevant because the cable's legal status depends partly on who may act for the island. The 15 October 2024 New York trilateral and the 9 November 2026 meeting on the island were framed by Ankara as steps toward confidence-building. Ankara's view is that a settlement must recognize the sovereign equality of the Turkish Cypriot people and that no unilateral Greek Cypriot action can bind Turkish Cypriot offshore rights.

A cable carries electricity, not hydrocarbons, so the legal question differs in kind. Ankara's argument is about process: coordination, consent and equal rights over offshore resources. For the hydrocarbon dimension, see Fact Check: Is Cyprus's Cronos Gas Development Taking Place in 'Undisputed Waters'? Block 6, Turkish Cypriot Rights and Ankara's Objections. On the two-state question and the UN process, see Fact Check: Does Türkiye's Two-State Position on Cyprus Mean Ankara Has Abandoned the UN Process? Fidan in Nicosia, the Erhürman Factor and Resolution 186.

🇹🇷 Official Policy · Primary Sources

Türkiye's Position

Ankara's official position, as stated by Turkish government sources, rests on the following points.

• Coordination in undelimited areas: Ankara argues that activity where the continental shelf is undelimited, or within its registered shelf and overlap areas, requires coordination, and that delimitation must follow the principle of equity rather than maximal island-based claims. Primary sources: Turkish Foreign Ministry statements and Türkiye's UN deposit of 18 March 2020.
• Equal rights of Turkish Cypriots: Ankara says Turkish Cypriots hold equal inherent rights over the island's offshore resources and that the Greek Cypriot Administration cannot act unilaterally on them. Primary sources: Turkish Foreign Ministry statements and the Türkiye–TRNC Continental Shelf Delimitation Agreement of 21 September 2011.
• No jurisdiction from solidarity or escorts: Ankara rejects the idea that EU solidarity or a third-state naval escort creates jurisdiction, because the EU has no competence over maritime delimitation. This links to its criticism of the so-called Seville Map. Primary source: Turkish Foreign Ministry statements.
• Openness to dialogue: Ankara cites President Recep Tayyip Erdoğan's 2020 proposal for an Eastern Mediterranean Conference including all coastal states and the Turkish Cypriots, and the TRNC's hydrocarbon cooperation and revenue-sharing proposals of 2011, 2012 and 2019. It says no arrangement excluding Türkiye and the TRNC can last, and welcomes confidence-building steps on the Cyprus track. Primary sources: Presidency statements and TRNC proposals.
• Sovereign rights, not hostility: Ankara frames its stance as the exercise of sovereign rights and relies on its 18 March 2020 UN registration and its 12 June 2025 IOC-UNESCO registration of Marine Spatial Planning, announced on 16 April 2025. Primary sources: UN and IOC-UNESCO registrations.

Ånkara's legal reasoning also reflects its position outside UNCLOS. Türkiye is not a party, and it argues that equitable delimitation principles reflect customary international law.

Source Comparison

The table compares how the main sources frame the same episode. Entries reflect the reporting and statements available to us and are not exhaustive.

Source	NAVTEX	Escort	Legal basis cited
Greek government and Greek City Times reporting	Turkish notice rejected; project under Greek and Cypriot permits	Reported French deployment described as protection	UNCLOS, customary law, permits
Greek Cypriot Administration	Project lawful; Turkish objections without basis (as reported)	Not separately verified	UNCLOS, Republic of Cyprus permits
France	No French statement verified in our sources	Reported deployment; no statement verified	Not verified
EU institutions	Not addressed in our sources	Not addressed	Project of Common Interest status; no competence on delimitation (Ankara's point)
Turkish Foreign Ministry (via TRT World)	Notice 1127/26 reported as consented coordination	Not directly addressed	Equity, Turkish Cypriot rights, UN registrations
International wire and analysis	Framed as a maritime dispute with competing notices	Framed as a test of third-state presence	Varies; often UNCLOS Article 79

The Greek framing treats the notice as a provocation and the escort as protection. Ankara treats the notice as an assertion of coordination it disputes and treats the escort as a risk of escalation. Both framings are available in the public record; the legal dispute remains open.

Key Terms & Related Guides

• NAVTEX: A coordinated system for broadcasting maritime safety and navigational warnings. It informs mariners and does not establish jurisdiction.
• Continental shelf and EEZ: Seabed and water zones defined under UNCLOS Articles 76, 74 and 83. Their limits require delimitation between states with opposite or adjacent coasts.
• Principle of equity: The approach in international law that delimitation should produce an equitable result, considering coastal geography and proportionality.
• Project of Common Interest: An EU designation for cross-border energy infrastructure.
• Blue Homeland (Mavi Vatan): Türkiye's term for its maritime jurisdiction interests in the Aegean, Eastern Mediterranean and Black Sea.
• Turkish Cypriots and the TRNC: The Turkish Cypriot community, co-founders of the Republic of Cyprus, and the Turkish Republic of Northern Cyprus (TRNC), proclaimed in 1983.

Related guides: About Multipolar Review: Mission, Perspective and Transparency, Editorial Principles and Primary Source Standards, Fact Check: Can Türkiye Close the Turkish Straits 'At Will' Under the Montreux Convention?, and Fact Check: Does Türkiye 'Control' the Bosphorus? Sovereignty, Free Passage and What the Montreux Regime Actually Gives Ankara.

Sister-publication analysis: Lines of Power: When a Cable Becomes a Corridor: The Great Sea Interconnector, the EU Enlargement Report and Why Delimitation Must Come Before Eastern Mediterranean Energy Lines and Politics of Nations: Greece Warns of an 'Operational Response' Over the Greece–Cyprus Cable: What Do the UN Charter, Consent and Continental Shelf Law Say?.

Multipolar Review Editorial Team

Multipolar Review presents global and regional affairs with a dedicated perspective from Türkiye. Sections marked 'Türkiye's Position' reflect official Turkish policy and legal doctrines as stated by Turkish primary sources.