Circe South

Overview

Circe South is a submarine cable spanning 115 kilometers, linking France and the United Kingdom across the English Channel. Commissioned in 1999, it provides a direct fiber-optic connection between the two countries. The cable plays a role in supporting telecommunications and data transfer across one of the busiest maritime and data corridors in the world. Its relatively short length reflects its purpose as a regional system, designed to facilitate high-speed, low-latency communication between the two landing points. Circe South is part of a broader network of submarine cables that enhance connectivity and resilience in Western Europe.

As a cross-Channel system, Circe South contributes to the dense web of submarine cables that sustain the digital infrastructure of Europe. While its exact current operational status is not publicly documented, its existence underscores the importance of robust international links in supporting modern economies and digital services.

Route and Landings

Circe South connects Cayeux-sur-Mer in France with Pevensey Bay in the United Kingdom. Cayeux-sur-Mer, located on the northern French coast in the Hauts-de-France region, is a strategic landing point due to its proximity to major European data hubs and its accessibility to inland fiber networks. The town is situated near the Bay of Somme, a region known for its natural beauty and historical significance, but also for its role in facilitating modern telecommunications infrastructure.

On the British side, the cable lands at Pevensey Bay in East Sussex. This coastal area is historically significant, known for its role in the Norman Conquest of 1066. Today, Pevensey Bay serves as a crucial node in the United Kingdom's telecommunications network. The English Channel, which the cable crosses, is one of the world's most heavily trafficked waterways, making it a vital corridor for both maritime and digital connectivity. Circe South’s route reflects the strategic importance of linking these two specific locations to bolster communication between the UK and continental Europe.

Ownership and History

Circe South is jointly owned by Zayo and euNetworks, two companies specializing in telecommunications infrastructure and services. The cable was brought into service in 1999, during a period of significant expansion in global submarine cable deployments. This era saw the rapid growth of the internet and the corresponding need for high-capacity, low-latency connections between major economic hubs.

The cable's ownership by Zayo and euNetworks highlights its integration into a broader portfolio of network assets, which these companies use to provide services such as bandwidth, cloud connectivity and data center interconnection. While specific details about upgrades or maintenance activities for Circe South have not been disclosed, its inclusion in the portfolios of these operators suggests it remains a valuable asset within the regional telecommunications landscape.

What Our Measurements Show

Our live monitoring of Circe South has identified 124 measured corridors along its route. The best round-trip time (RTT) recorded is 13 milliseconds, while the average RTT is approximately 37 milliseconds. These measurements indicate that the cable provides relatively low-latency communication, which is critical for applications such as financial trading, cloud computing and real-time data transfer.

The performance metrics suggest that Circe South is capable of supporting modern digital demands, despite its age. The low RTT values are consistent with the cable's short length and its direct route across the English Channel. These characteristics make it a valuable link for regional connectivity between France and the United Kingdom, contributing to the overall resilience and efficiency of European telecommunications infrastructure.