Antigua-St.Kitts: A Short Submarine Link in the Eastern Caribbean
The Antigua-St.Kitts submarine cable is a 14-kilometer fiber-optic system connecting
Basseterre in Saint Kitts and Nevis to
St. John’s in Antigua and Barbuda. Operational since 1995, according to GeoCables records, it is owned by Liberty Networks and listed as in service. This cable forms part of the Eastern Caribbean's telecommunications infrastructure, linking two island nations separated by a relatively short marine distance.
What stands out about the Antigua-St.Kitts cable is its brevity, at just 14 km, making it one of the shortest international submarine cables in the region. However, public information about its design capacity, fiber count, supplier, and technology is not disclosed, leaving gaps in understanding its technical specifications and performance capabilities. These omissions highlight the challenge of documenting smaller, regional cables, which often receive less public and industry attention compared to larger transoceanic systems.
Quick facts
| Cable name | Antigua-St.Kitts |
| Length | 14 km |
| Ready for service (RFS) | 1995 (GeoCables database) |
| Owners | Liberty Networks |
| Status | In service |
| Design capacity | Not disclosed |
| Fiber pairs | Not disclosed |
| Supplier | Not disclosed |
| Technology | Not disclosed |
| Landing points | Basseterre (Saint Kitts and Nevis); St. John’s (Antigua and Barbuda) |
Route
The cable connects Basseterre, the capital of Saint Kitts and Nevis, to St. John’s, the capital of Antigua and Barbuda. Both landing points are located in the Eastern Caribbean, a region characterized by close island proximities and shared economic and cultural ties. The corridor spans a modest 14 km across the sea, making the Antigua-St.Kitts cable one of the shortest international connections in the Caribbean.
At Basseterre, the cable shares its landing site with other systems, including the
Saba, Statia Cable System (SSCS) and
Southern Caribbean Fiber, which provide additional routes to neighboring islands and beyond. Similarly, at St. John’s, the cable intersects with the
Eastern Caribbean Fiber System (ECFS), a larger regional network connecting multiple Caribbean nations.
Why it was built and what it carries
The Antigua-St.Kitts cable was likely built to support direct telecommunications between Saint Kitts and Nevis and Antigua and Barbuda, facilitating voice, data, and internet services. Its short length suggests that it serves primarily regional traffic rather than long-haul international connectivity. The cable helps integrate the economies and societies of these two island nations, which are part of the Organization of Eastern Caribbean States (OECS), a regional bloc promoting cooperation and development.
Given the lack of disclosed design capacity and fiber count, it is unclear whether the cable has been upgraded since its commissioning or what its current traffic load might be. However, its continued operation under Liberty Networks indicates that it remains relevant to local connectivity needs.
History: what can be established
GeoCables records the cable’s ready-for-service (RFS) date as 1995. If alternative dates circulate in industry sources, they are not publicly documented or widely reported, leaving the GeoCables value unchallenged. The absence of historical data on its construction, supplier, or initial capacity further limits the ability to reconstruct its early operational history.
Capacity and technology
Publicly available information does not disclose the cable’s design capacity, fiber count, or technology. Without operator documentation, these details cannot be reliably inferred. Given its age and regional focus, it is plausible that the cable has undergone upgrades to remain compatible with modern telecommunications demands, but this remains speculative.
Latency: the physics
Theoretical latency for the Antigua-St.Kitts cable is extremely low due to its short length. Light propagation over 14 km of fiber results in a one-way latency floor of approximately 0.1 milliseconds, with a round-trip time (RTT) floor of the same value. However, real-world latency is higher due to factors such as land-based network extensions, terminal equipment delays, and routing inefficiencies. No live measurements are available to quantify its actual performance.
Redundancy: what happens if it breaks
If the Antigua-St.Kitts cable were to experience a fault, redundancy is provided by other regional systems. At Basseterre, alternative routes include the Saba, Statia Cable System (SSCS) and Southern Caribbean Fiber. At St. John’s, connectivity could be maintained via the Eastern Caribbean Fiber System (ECFS). These systems ensure that the islands remain connected to regional and international networks, albeit with potential rerouting delays.
Repair logistics for such a short cable would typically involve mobilizing a cable repair ship to locate the fault, retrieve the damaged segment, and splice or replace it. Standard industry practices include pre-surveying the seabed to minimize disruption during repairs.
Bottom line
- The Antigua-St.Kitts cable is a 14-km submarine system linking Basseterre (Saint Kitts and Nevis) and St. John’s (Antigua and Barbuda).
- GeoCables records its ready-for-service date as 1995; no alternative dates are documented.
- Owned by Liberty Networks, it remains in service but lacks disclosed data on capacity, fiber pairs, supplier, or technology.
- Theoretical latency is extremely low (≈0.1 ms RTT), but real-world performance is higher due to additional network factors.
- Redundancy is provided by regional systems like SSCS, Southern Caribbean Fiber, and ECFS.