Isle Au Haut Cable: A Short Submarine Link in Maine
The Isle Au Haut Cable is a submarine telecommunications cable connecting the small island community of
Isle au Haut to the mainland at
Stonington, Maine, United States. With a length of just 10 km, it is among the shortest submarine cables globally, designed to provide high-speed internet connectivity to the island's residents. Owned by Axiom Technologies, the cable is listed as in service, with a recorded ready-for-service (RFS) year of 2024 in GeoCables' database.
This cable is notable for its localized purpose, connecting a remote island to the mainland. While its design capacity, fiber pair count, supplier, and specific technological details are not publicly disclosed, its short distance and targeted function make it an interesting case study in small-scale submarine cable deployment. Publicly available data does not confirm whether the cable employs advanced technologies such as wavelength division multiplexing (WDM) or other high-capacity configurations.
Quick facts
| Cable name | Isle Au Haut Cable |
| Length | 10 km |
| Ready-for-service year | 2024 (GeoCables database) |
| Owners | Axiom Technologies |
| Status | In service |
| Design capacity | Not disclosed |
| Fiber pairs | Not disclosed |
| Supplier | Not disclosed |
| Technology | Not disclosed |
| Landing points | Isle au Haut (United States); Stonington (United States) |
🗺 Show Isle Au Haut Cable on the interactive cable map
Route
The Isle Au Haut Cable connects Isle au Haut, a small island located in Penobscot Bay, Maine, to the nearby mainland town of Stonington. This short 10 km route traverses the bay, providing a direct link between the island community and the mainland. Isle au Haut is known for its remote location and limited infrastructure, making the cable an essential asset for modern connectivity. Stonington serves as the mainland landing point, a town with a history of fishing and maritime activity.
Why it was built and what it carries
The Isle Au Haut Cable was built to address the connectivity needs of Isle au Haut, a remote island community with limited access to high-speed internet. The cable likely carries standard telecommunications traffic, including internet, voice, and possibly data services, although specific details about its capacity and configuration are not publicly disclosed. Axiom Technologies, the owner, specializes in providing broadband services to underserved areas, suggesting the cable plays a role in bridging the digital divide for the island's residents.
History: what can be established
GeoCables records the cable's ready-for-service year as 2024, and it is currently listed as in service. No conflicting dates have been identified in publicly available industry sources, so this timeline appears reliable. The construction of the cable represents a significant investment in improving connectivity for Isle au Haut, aligning with broader trends of deploying submarine cables to remote or underserved locations.
Capacity and technology
The design capacity, fiber pair count, supplier, and specific technologies used in the Isle Au Haut Cable are not publicly disclosed. Without operator documentation, it cannot be stated whether the cable employs advanced multiplexing technologies or other innovations typically seen in larger submarine cables. Given its short length and localized purpose, it is plausible that the cable has a simpler design compared to transoceanic systems, but this remains speculative without further data.
Latency: the physics
The theoretical one-way light propagation time over the 10 km wet segment of the cable is approximately 0.0 ms, with a round-trip time (RTT) floor of about 0.1 ms, assuming light travels at 200,000 to 204,000 km/s in fiber. However, real-world latency is higher due to additional factors such as land tails, terminal equipment, and routing inefficiencies.
Live measurements from remote probes show significantly higher RTT values, ranging from 127.7 ms (Kyiv to Isle au Haut) to 245.5 ms (Singapore to Isle au Haut). These measurements reflect the full internet path, including terrestrial network segments and routing delays, rather than the cable itself.
Redundancy: what happens if it breaks
The Isle Au Haut Cable is the only known submarine link connecting Isle au Haut to the mainland. If the cable were to experience a fault, the island would likely rely on alternative connectivity methods such as satellite or wireless point-to-point systems, which are typically slower and less reliable. Repairing a submarine cable of this length would involve standard industry practices, including fault localization, cable retrieval, and splicing or replacement. Given its short length, repair operations would likely be faster and less complex than those for longer cables.
Bottom line
- The Isle Au Haut Cable is a 10 km submarine cable connecting Isle au Haut to Stonington, Maine.
- Owned by Axiom Technologies, it is listed as in service with a recorded RFS year of 2024.
- Design capacity, fiber pairs, supplier, and technology details are not publicly disclosed.
- Theoretical RTT over the wet segment is approximately 0.1 ms, but real-world latency is much higher due to land tails and routing.
- Redundancy options for Isle au Haut are limited, with potential reliance on satellite or wireless systems in case of cable failure.