What Is the Kardesa Cable? The Black Sea's Russia-Free Digital Corridor, Explained

The Black Sea has almost no subsea cable capacity. Kardesa is the attempt to change that — and to route Europe–Asia data around Russia in the process. Here is what is actually known.

What is Kardesa?

Kardesa is a planned submarine fibre-optic cable system across the Black Sea, announced in October 2025 by Vodafone Group and Vodafone Ukraine. It is designed to add more than 500 terabits per second of capacity to a region that currently has very little, and to create an east–west digital corridor between Europe and Asia that does not cross Russian territory.

Who is building it?

Vodafone Ukraine is the developer. It is wholly owned by NEQSOL Holding, the Azerbaijani group, and operates as a Vodafone Partner Market rather than a Vodafone Group subsidiary — Vodafone Group is supporting the build rather than owning the asset. The construction contract has gone to Xtera, the UK-based submarine systems supplier.

What does it cost?

Reported at more than €100 million. Some coverage has cited roughly $116 million; the euro figure is the one the partners have used, and no updated budget has been published since the announcement.

Where will it land?

Four countries, in sequence. The first landing is planned in Bulgaria in 2027, followed by Türkiye, Georgia and Ukraine. Exact landing sites have not been published.

Work on the Ukrainian section carries an explicit constraint: Vodafone has said it will take place “exclusively in internationally recognised safe zones.”

Why does the Black Sea need it?

Because the alternative routes have become liabilities. Data moving between Asia and Europe today travels either north through Russian terrestrial networks or south through the Red Sea and Mediterranean, where repeated cable damage has made the corridor difficult to underwrite.

The Black Sea itself is thinly served. The Caucasus Cable System, laid in 2008 between Georgia and Bulgaria, has carried much of the regional load for close to two decades. A 500 Tbps system is a step change rather than an increment.

How does it relate to the Caspian cable?

They are two halves of the same geography. At the eastern end, the Trans-Caspian cable between Azerbaijan and Kazakhstan — also a NEQSOL-linked project, through AzerTelecom — crosses the Caspian with up to 400 Tbps. Kardesa crosses the Black Sea. Between them sits Georgia, the land bridge connecting the two seas.

Taken together they describe the data-layer version of the Middle Corridor: a continuous east–west path that avoids both Russian territory and the southern chokepoints.

What has to go right

Construction has not started. As of the most recent public information, the project is at the pre-build stage with a 2027 first landing. The Caspian cable — a shorter, cheaper, less politically exposed system — took its own timeline from Q3 2026 to year-end. A four-landing Black Sea build has more ways to slip.

The Black Sea is a security environment, not just a body of water. Subsea infrastructure there is exposed in ways the commercial case does not price easily. Insurance, routing and the “safe zones” constraint on the Ukrainian section are live variables.

Capacity is not demand. 500 Tbps is a design figure, not contracted traffic. The system earns its return only if carriers and hyperscalers commit to the route.

What to watch

A construction start date, named landing sites, and the first anchor customers. Those three will tell you more about Kardesa’s prospects than any capacity figure.

Further Reading

• Trans-Caspian Cable: The Construction Is Finished. The Launch Date Is Still Moving.
• NEQSOL Holding: group structure and coverage
• The Middle Corridor: the Trans-Caspian trade route

Sources: Vodafone Group newsroom; Vodafone Ukraine / NEQSOL Holding announcements, October 2025; EU4Digital; Data Center Dynamics; Total Telecom.