Fact Check: Is Türkiye's NAVTEX Over the Crete Cable Survey 'Null and Void'? What the Law on Seabed Cables, Survey Permits and Overlapping Continental Shelf Claims Says

Why It Matters

A NAVTEX is a navigational-safety warning, not a title to seabed. The rival messages issued southeast of Crete around 27–29 October 2026 over the survey ship KOBI RUEGG therefore cannot, by themselves, settle whether Greece or Türkiye has jurisdiction, because no maritime boundary has been agreed there and both states assert overlapping continental shelf entitlements.

Two claims circulate in coverage of the episode. The first is that a Turkish NAVTEX over a cable survey is illegal or 'null and void' because the area is Greek continental shelf and exclusive economic zone (EEZ). The second is that Türkiye is trying to block a neutral, purely commercial cable project. This Fact Check separates what is documented from what is legal argument, in line with our Editorial Principles.

One limit applies throughout: we could not verify the text, coordinates or stated purpose of the Turkish NAVTEX. Everything about its content below is therefore treated as unconfirmed.

Claim vs. Fact Analysis

Claim 1 presents a legal conclusion as settled fact. Claim 2 attributes motive without evidence. Public reporting confirms rival warnings and a Greek survey permit dated 2 October. It does not confirm the Turkish text, any delimitation of the area, or any Turkish objection to fibre-optic cables as such.

What is actually reported

According to Greek City Times (28–29 October 2026), Greece and Türkiye issued rival NAVTEX messages southeast of Crete concerning the Bahamas-flagged survey ship KOBI RUEGG. The vessel is reported to be mapping the seabed for a planned fibre-optic cable linking Saudi Arabia to Europe via Greece, under a Greek permit dated 2 October.

The same reporting says the Greek warning, issued by the Heraklion station on 27 October, described the Turkish notice as 'null and void', as coming from an 'unauthorised station', and as mostly covering areas Athens considers part of its continental shelf and EEZ. Those descriptions are the Greek side's characterisation as reported. They are not findings by any court or international body.

On the same day, 27 October, the Turkish Foreign Ministry stated that Türkiye's Aegean and Eastern Mediterranean policy 'remains unchanged', according to Anadolu Agency as relayed by News.az. The excerpt we reviewed does not link that statement to the survey, so we do not treat it as a direct reply.

What NAVTEX is and what it legally does

NAVTEX is an automated broadcast of maritime safety information, part of the World-Wide Navigational Warning Service coordinated by the International Maritime Organization (IMO) and the International Hydrographic Organization (IHO). The Mediterranean falls in METAREA III. National stations, such as Heraklion for Greece and Izmir and Antalya for Türkiye, broadcast warnings about exercises, survey operations and hazards.

The framework is operational. The IMO/IHO instruments establishing these service areas state, in substance, that area delimitation does not prejudice the delimitation of boundaries between states. A NAVTEX therefore cannot create sovereignty or confer a permit, and it cannot be annulled by a rival state's declaration.

Rival NAVTEX messages are an established feature of Greek–Turkish relations. They have appeared repeatedly since the 2000s in the Aegean, and again in the Eastern Mediterranean around the August 2020 Oruç Reis survey, which coincided with the Greece–Egypt partial EEZ agreement of 6 August 2020. Each side uses them to signal claims, and each calls the other's notice invalid. That pattern shows the dispute lives in the underlying law, not in the messages.

Claim 1: 'The Turkish NAVTEX is illegal because the area is Greek shelf/EEZ'

Where the claim comes from: the Greek Heraklion warning of 27 October, as reported by Greek City Times, and Greek-aligned coverage repeating it.

What the documents show.

• The cable rule is narrower than often summarised. UNCLOS Article 79(1) entitles all states to lay submarine cables and pipelines on the continental shelf. Article 79(2) says the coastal state may take reasonable measures for exploring the shelf, exploiting its resources and controlling pollution from pipelines, but may not impede the laying or maintenance of cables. This descends from Article 4 of the 1958 Geneva Convention on the Continental Shelf, which Ankara and others treat as reflecting customary law.
• A common error. Some summaries say the course of a cable needs the coastal state's consent. The text of Article 79(3) applies that consent requirement to pipelines, not cables. Article 79(4) separately preserves coastal-state jurisdiction over cables built or used in connection with its shelf activities. Article 58 gives other states the freedom to lay cables in an EEZ, with due regard to the coastal state.
• The survey is not the same as the laying. A route survey can be treated as hydrographic survey or, in some views, as marine scientific research. For the shelf and EEZ, Articles 56, 246 and 249 and Part XIII give the coastal state consent rights over marine scientific research. States disagree on where a commercial route survey falls, so this is contested, not settled.
• The permit issuer matters. A Greek permit authorises the survey only if Greece is the coastal state for that seabed. If the shelf is an unresolved overlap, 'whose consent counts' is the open question. Neither Athens' permit nor Ankara's NAVTEX answers it.

Verdict: unproven as stated. The Greek position is a legitimate legal claim. 'Null and void' is a legal characterisation, not an established fact, and the reverse Turkish characterisation would be equally unproven.

Who has jurisdiction? The two positions

Greece's position, as stated in official Greek sources, is that islands, including Crete, generate full continental shelf and EEZ under Article 121 of UNCLOS and that the median line is the proper starting point for delimitation. Athens also says the only dispute with Türkiye is delimitation of the shelf and EEZ, which it would take to the International Court of Justice (ICJ). Greece is a party to UNCLOS.

Türkiye's position is that no maritime boundary has been delimited in the area, and that delimitation must be effected by agreement on the basis of international law to achieve an equitable solution. Articles 74 and 83 reflect this standard. The ICJ cases Ankara cites show that islands may receive reduced or no effect where they distort the coastal projection of a mainland: North Sea Continental Shelf (1969), Libya/Malta (1985) and Black Sea (2009). Türkiye has about 870 km of Eastern Mediterranean coastline, the longest in the basin.

Both sides are bound by the same pending-delimitation duty. Articles 74(3) and 83(3) require states to make every effort to enter into provisional arrangements of a practical nature and not to jeopardise or hamper the final agreement. Ankara reads unilateral permits in overlap areas as testing that duty. Athens argues the opposite, that the area is its own shelf and EEZ and that it is not acting in a disputed zone.

Whether Türkiye's non-party status to UNCLOS changes this is covered in our guide is Türkiye bound by UNCLOS. In short, customary law and the equity principle apply to both states.

The Libya memorandum and what it does not prove

On 27 November 2019 Türkiye and Libya's Government of National Accord signed a Maritime Jurisdiction Delimitation MoU. Türkiye registered the outer limits of its continental shelf with the United Nations on 18 March 2020. Greece, the EU and Egypt contest the MoU, and Libyan political authorities have taken different positions on it over time. Greece argues it ignores the entitlements of its islands, and the European Council in December 2019 said it infringed the sovereign rights of third states.

The overlap zone between Crete and Libya's coast is part of this wider dispute. But public reporting does not show that the KOBI RUEGG survey area lies inside the MoU's coordinates, so we do not claim that the MoU automatically covers it. The exact coordinates of both the survey corridor and the MoU would need checking.

Claim 2: 'Türkiye is blocking a neutral, purely commercial cable'

Where the claim comes from: commentary framing the NAVTEX as obstruction of an infrastructure project.

What can be said. In the reporting reviewed, there is no verified Turkish text objecting to fibre-optic cables as such, and we found no such statement. A project can be commercially legitimate and still sit in an area where coastal states disagree about jurisdiction. Whether a Turkish notice 'blocks' anything depends on its content, which we could not verify.

Verdict: unproven. Commercial neutrality of the operators and contractor is not in question here. The dispute is over who regulates the seabed route. Ankara's stated line, set out below, is that rights in the area require coordination, not that cables are unwelcome.

Earlier cable friction: Great Sea Interconnector and Kasos

The Great Sea Interconnector is a planned electricity link between Greece, Cyprus and Israel that has had EU political support. In July 2024, survey work near Kasos was reported to have been suspended after Turkish naval activity and NAVTEX messages. Accounts differ on what exactly occurred and on how the surveys were authorised. We therefore cite only the fact of friction and not the details. Cyprus links the project to the island's shared offshore resources. Egypt's 2003 agreement with the Greek Cypriot administration is analysed in The Geopolitical Compass.

Other actors

• EU Commission: supports Greece and the interconnector project; Ankara disputes EU competence over delimitation.
• Libya: rival authorities, with the 2019 MoU contested.
• Egypt: signed a partial EEZ deal with Greece on 6 August 2020.
• United States and NATO: have urged de-escalation in earlier episodes; we found no statement on this incident in our sources.
• Operators, Saudi Arabia and the survey contractor: present as commercial parties, not political actors.

Source Comparison

The sources use similar words for different kinds of statement. The table separates factual reports from legal claims and from binding law, which helps readers judge what each source can establish.

Facts: the rival warnings were issued; a Greek permit is dated 2 October; the ship is Bahamas-flagged. Legal claims: 'null and void', 'unauthorised', 'illegal', and 'blocking'. Each remains unresolved without a delimitation, an agreement, or a decision by a body both sides accept.

A lawful way forward

The legal record points to four routes. Provisional arrangements under Articles 74(3) and 83(3) are the first. A negotiated delimitation agreement is the second. ICJ or arbitration is possible only by mutual consent and an agreed scope. The fourth is a regional conference such as the one Ankara proposed in 2020. A coordinated survey notification would reduce friction while talks proceed.

Key Terms & Related Guides

The terms below recur in this dispute. The linked guides explain each in depth.

• NAVTEX / METAREA III: a maritime safety broadcast system and the Mediterranean service area; no sovereignty effect.
• Continental shelf and EEZ: seabed and water-column zones defined by UNCLOS and customary law; delimited by agreement under Arts 74 and 83.
• Blue Homeland (Mavi Vatan): Türkiye's maritime jurisdiction doctrine; see Blue Homeland and the Eastern Mediterranean: Türkiye's Maritime Jurisdiction Explained.
• Principle of equity: the delimitation standard applied by the ICJ, under which islands may receive reduced effect.
• Related reading: Fact Check: Common Claims About Türkiye in International Media, the sister-site analysis at Archive of Nations, and our About page on methodology.

Regionalbalance Editorial Team. Regionalbalance 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.