A Cable, Not a Pipeline
On August 31, 2026, Greek Foreign Minister Giorgos Gerapetritis said work on the Great Sea Interconnector — the €1.9 billion subsea cable meant to link the power grids of Greece, Cyprus, and eventually Israel — could resume "within the next few months, and possibly before the end of 2026." Asked whether Turkey's approval was required first, he was blunt: "International law is clear: it does not require Turkey's permission. Nor will any permission be sought from Turkey." (Cyprus Mail)
He is right, and the reason is more precise than "Greece says so." The UN Convention on the Law of the Sea draws a sharp line between two categories of undersea infrastructure that get conflated in almost every account of this dispute: pipelines and cables. Article 79 lets a coastal state control the route of a pipeline crossing its continental shelf — pipelines can rupture and damage shelf resources the coastal state has sovereign rights over. Cables get no such carve-out. Laying and maintaining submarine cables sits alongside navigation and overflight among the freedoms every state retains even in another state's exclusive economic zone, a distinction the UN's own legal archive still uses to teach the rule. (UN Audiovisual Library of International Law)
Greek Deputy Foreign Minister Tasos Chatzivasileiou made the identical point five days earlier: "Based on international law, permission is not required, let alone for a peaceful infrastructure project which will connect Europe with the Middle East." (Cyprus Mail)
Turkey's Selective Invocation
Turkey's counter-argument, laid out at length in a Daily Sabah op-ed, leans on the claim that "marine scientific research on the shelf engages coastal-state consent" and that a 2019 Turkey-Libya maritime delimitation memorandum documents Ankara's claim over waters the cable crosses. When a survey vessel began seabed work near Kasos and Karpathos in July 2024, Turkey's answer was warships, not a legal filing. (Daily Sabah)
Steelmanning that case fairly: Turkey isn't wrong that a modern HVDC interconnector isn't neutral infrastructure. The Great Sea Interconnector carries fiber-optic strands for control and telemetry alongside its power conductors, and a state with genuinely unresolved shelf claims in a semi-enclosed sea has a real interest in knowing what crosses its seabed. The Aegean and Eastern Mediterranean delimitation dispute between Greece and Turkey is decades old, and no court both sides accept has settled it.
But Turkey wants the benefit of a treaty framework — coastal-state consent over shelf pipelines — that it has refused to join for the 44 years since UNCLOS opened for signature. Turkey is one of a small handful of UN member states that has never ratified the convention, precisely because it rejects the rule that islands generate full maritime zones — a rule that, applied in the Aegean, shrinks Turkey's claimed shelf substantially. Invoking Article 79's shelf logic against a cable while rejecting the treaty that defines whose shelf it is isn't a legal position; it's a veto dressed as one.
Why the Distinction Matters Beyond This Cable
This isn't an abstract dispute. €657 million of the project's cost is a Connecting Europe Facility grant committed to a specific 898-kilometer Cyprus-to-Crete route that the European Commission's Global Gateway program has staked out as strategic infrastructure. (European Commission) Cyprus is on the hook for roughly 63% of the remaining cost and Greece 37% — real money riding on a routing question that has already slipped two years past its original 2024 target. (Euronews)
If a non-UNCLOS coastal state can freeze a cable project indefinitely simply by asserting an unresolved shelf claim and parking warships nearby, every subsea cable planner in a contested sea — the South China Sea, the Persian Gulf, the Black Sea — inherits the same informal veto. That is exactly the "reasonable coastal-state measures" creep maritime scholars have flagged in Indonesian and Chinese cable practice: consent language written for pipelines quietly annexed to cables through domestic enforcement rather than treaty amendment. Global data and energy connectivity — the physical layer under every open-internet claim this publication makes — runs through precisely this kind of ungoverned gray zone.
The Fix Isn't Silence, It's a Process
Greece's legal position doesn't require ignoring Turkey's operational objections outright. A standing bilateral notification-and-consultation channel — route data shared ahead of survey and lay operations, with an agreed buffer from genuinely disputed shelf area — would cost Athens and Nicosia little they aren't already conceding in practice, since the current route already runs around most of the contested seabed. What it would deny Turkey is the precedent that naval deployment, not diplomacy or adjudication, is a legitimate response to a lawful survey vessel. Athens has paired its legal claim with an operational one, signaling it is prepared to keep contractors working rather than wait indefinitely for an agreement with Ankara that shows no sign of arriving.
Turkey has legitimate avenues to press its shelf claims: bilateral delimitation talks, or accession to UNCLOS followed by arbitration at the International Tribunal for the Law of the Sea. Naval intimidation of a civilian survey ship is not one of them — and treating it as a workable veto over EU-funded infrastructure would teach every coastal state with an unresolved boundary that the fastest way to control a neighbor's cable route is a frigate, not a lawyer.