Finland-Estonia 2 (EESF-2): A Baltic Sea Link
The Finland-Estonia 2 (EESF-2) submarine cable connects
Helsinki, Finland, and
Tallinn, Estonia, across the Baltic Sea. Spanning 98 kilometers, it is part of a broader network of cables linking these two nations, facilitating digital communication and data transfer. The cable is owned by Arelion and Telia Eesti, with the latter having undergone several rebrandings (formerly Eesti Telekom, EMT, and Elion). It is listed as in service, though public sources do not disclose certain technical details, such as design capacity, fiber count, or supplier information.
What stands out about EESF-2 is its relatively early recorded ready-for-service (RFS) date of 1992, which places it among the older operational submarine cables in the region. This date, however, is subject to scrutiny, as industry sources occasionally report discrepancies in the commissioning years of older cables. Additionally, while the cable's theoretical latency floor is well-defined, real-world latency measurements reveal the complexities of routing and equipment beyond the wet segment.
Quick facts
| Cable name | Finland-Estonia 2 (EESF-2) |
| Length | 98 km |
| Ready-for-service year | 1992 (GeoCables database; potential conflicts noted) |
| Owners | Arelion, Telia Eesti |
| Status | In service |
| Design capacity | Not disclosed |
| Fiber pairs | Not disclosed |
| Supplier | Not disclosed |
| Technology | Not disclosed |
| Landing points | Helsinki (Finland), Tallinn (Estonia) |
🗺 Show Finland-Estonia 2 (EESF-2) on the interactive cable map
Route
The EESF-2 cable traverses the Baltic Sea between Helsinki and Tallinn, two cities separated by approximately 98 kilometers. Both landing points are major hubs for submarine cable connectivity. Helsinki hosts numerous cables, including
C-Lion1,
Eastern Light Sweden-Finland I, and
Finland-Estonia 3 (EESF-3), while Tallinn is similarly connected to cables such as
E-FINEST and
Sweden-Estonia (EE-S 1). This corridor is a critical link between Finland and Estonia, supporting cross-border communication and data exchange.
Why it was built and what it carries
EESF-2 was built to enhance connectivity between Finland and Estonia, two neighboring nations with strong economic and cultural ties. The cable likely supports a mix of internet traffic, enterprise data, and other telecommunications services. While its specific design capacity is not publicly disclosed, its role within the regional network suggests it contributes to redundancy and bandwidth availability in the Baltic Sea corridor. The cable's construction in the early 1990s reflects the growing demand for international connectivity during that period.
History: what can be established
The GeoCables database records the ready-for-service year of EESF-2 as 1992. This date aligns with the early expansion of submarine cable networks in Europe, driven by increasing internet adoption and cross-border communication needs. However, older cables often have conflicting commissioning dates in industry sources, and without operator documentation, it is impossible to verify the exact year with certainty. The cable has remained in service for over three decades, indicating regular maintenance and upgrades to keep it operational.
Capacity and technology
Publicly available data does not disclose the design capacity, fiber pair count, supplier, or specific technology used in EESF-2. Given its age, the cable likely underwent upgrades to remain compatible with modern telecommunications standards. Without operator documentation, attributing these details would be speculative.
Latency: the physics
The theoretical one-way light propagation latency for EESF-2 is approximately 0.5 milliseconds over its 98-kilometer wet segment, resulting in a round-trip time (RTT) floor of roughly 1.0 milliseconds. However, real-world latency is higher due to additional factors such as land tails, terminal equipment, and routing. GeoCables' live measurements, which include the full internet path rather than the cable alone, show significant variability: for example, Saint Petersburg to Tallinn has a minimum RTT of 21.0 milliseconds, while Sydney to Tallinn registers 280.6 milliseconds. These figures highlight the broader network dynamics beyond the cable itself.
Redundancy: what happens if it breaks
If EESF-2 were to experience a fault, redundancy is provided by several alternative cables in the same corridor, including the
Baltic Sea Submarine Cable,
Finland Estonia Connection 1 (FEC-1),
Finland Estonia Connection 2 (FEC-2), and
Mjolner East. Repairing submarine cables typically involves deploying specialized vessels to locate and fix the fault, a standard industry practice. The presence of multiple cables ensures that connectivity between Finland and Estonia would not be entirely disrupted during outages.
Bottom line
- EESF-2 connects Helsinki, Finland, and Tallinn, Estonia, across the Baltic Sea.
- Spanning 98 kilometers, it has been in service since at least 1992, though the date may be subject to verification.
- Owned by Arelion and Telia Eesti, the cable's technical specifications are not publicly disclosed.
- Theoretical latency floor is approximately 1.0 ms RTT over the wet segment, but real-world measurements are higher.
- Redundancy is provided by several alternative cables in the same corridor.