IOEMA: A Multi-Landing Submarine Cable in Northern Europe
The IOEMA submarine cable spans 1620 kilometers, connecting multiple landing points across Denmark, the United Kingdom, the Netherlands, Norway, and Germany. Owned by IOEMA Fibre, the cable is listed as in service, although its recorded ready-for-service (RFS) year in the GeoCables database is 2028. This cable serves as a significant addition to the dense network of submarine cables in the North Sea region, providing connectivity between major hubs and coastal cities.
What stands out about IOEMA is the extensive number of landing points it serves, including
Blaabjerg,
Broadstairs,
Domburg,
Eemshaven,
Houstrup,
Kristiansand,
Leiston,
Lowestoft,
The Hague, and
Wilhelmshaven. This broad geographical reach suggests its importance in linking diverse markets and enhancing redundancy in a corridor already populated with other cables. However, many technical details, such as design capacity, fiber count, and supplier, remain undisclosed in public sources, leaving room for speculation about its full capabilities.
Quick facts
| Cable name | IOEMA |
| Length (km) | 1620 |
| Ready-for-service year | 2028 (GeoCables database); industry sources not reviewed |
| Owner | IOEMA Fibre |
| Status | Listed as in service |
| Design capacity | Not disclosed |
| Fiber pairs | Not disclosed |
| Supplier | Not disclosed |
| Technology | Not disclosed |
| Landing points | Blaabjerg, Broadstairs, Domburg, Eemshaven, Houstrup, Kristiansand, Leiston, Lowestoft, The Hague, Wilhelmshaven |
Route
The IOEMA cable connects ten landing points across five countries in Northern Europe. In Denmark, it lands at Blaabjerg and Houstrup, while the United Kingdom hosts landing stations at Broadstairs, Leiston, and Lowestoft. The Netherlands is served by Domburg, Eemshaven, and The Hague, whereas Kristiansand in Norway and Wilhelmshaven in Germany complete the route. This corridor traverses the North Sea, a region known for its dense network of submarine cables supporting European connectivity.
Why it was built and what it carries
The IOEMA cable was likely built to enhance connectivity and redundancy in the North Sea region, which is a critical hub for data traffic between Northern and Western Europe. Its multiple landing points suggest it is designed to serve diverse markets, including urban centers and smaller coastal cities. While the cable's design capacity and specific technological features are not publicly disclosed, it is reasonable to assume that it supports high-speed data transmission, given the competitive landscape of submarine cables in the area.
History: what can be established
The GeoCables database lists IOEMA as in service, with a recorded ready-for-service year of 2028. However, this date raises questions, as the cable is already operational according to its status. If the RFS year of 2028 is accurate, it could indicate that the cable underwent phased deployment or upgrades that have yet to be completed. Alternatively, the discrepancy could stem from differences in how "in service" is defined by various sources. Without further documentation from IOEMA Fibre or other industry records, the exact timeline remains uncertain.
Capacity and technology
Publicly available data does not disclose the design capacity, fiber pairs, supplier, or technology used in the IOEMA cable. Without operator documentation, attributing specific figures or features would be speculative. Given its geographical scope and the competitive nature of the North Sea cable corridor, it is likely equipped with modern technology to support high-capacity data transfer, but this cannot be confirmed.
Latency: the physics
The computed one-way light propagation latency over the 1620 km wet segment of the IOEMA cable is approximately 7.9 milliseconds, with a theoretical round-trip time (RTT) floor of 15.9 milliseconds. Real-world latency measurements, however, include additional delays from land-based infrastructure, terminal equipment, and routing. For example, GeoCables' live measurements show a minimum RTT of 46.7 ms between Broadstairs and Kristiansand, significantly higher than the theoretical floor due to these additional factors.
A measurement artifact is present in the Moscow-to-Broadstairs latency data, where a minimum RTT of 9.3 ms was recorded-well below the physical floor of 15.9 ms for the wet segment alone. This discrepancy is likely due to rate-limited ICMP replies from intermediate routers and should not be interpreted as the actual cable performance.
Redundancy: what happens if it breaks
The North Sea region is well-served by numerous submarine cables, providing redundancy in case of disruptions to the IOEMA cable. For example, Blaabjerg is also connected by
CANTAT-3,
DANICE, and
Havfrue/AEC-2, while Broadstairs hosts
Mercator and
Tangerine. Similarly, Kristiansand is a landing point for Havfrue/AEC-2,
Havsil,
N0r5ke Viking 2,
Norfest, and
Skagerrak 4. These alternative cables ensure that data traffic can be rerouted in the event of a failure, minimizing the impact on connectivity.
Repairing submarine cables typically involves deploying specialized cable ships equipped with remotely operated vehicles (ROVs) to locate and repair the damaged sections. The North Sea's relatively shallow waters facilitate repair operations, although adverse weather conditions can pose challenges.
Bottom line
- IOEMA spans 1620 km and connects ten landing points across Denmark, the United Kingdom, the Netherlands, Norway, and Germany.
- Its recorded ready-for-service year is 2028, though it is listed as in service, raising questions about its timeline.
- Design capacity, fiber count, supplier, and technology are not publicly disclosed.
- Computed latency over the wet segment is approximately 7.9 ms one-way, with real-world RTTs higher due to additional factors.
- Redundancy is provided by numerous alternative cables in the North Sea region.