Weno, Chuuk, Micronesia: no other cable lands within 50 km.
On an island this means losing the submarine link; on the mainland traffic can still go over land.
No alerts from our monitoring on this cable in the last 180 days. Events feed →
Counted: other international cables landing in the same country (domestic cables between points of one country are not a way out), other cables at landing points within 50 km, and whether the country has land links. Not counted: cable capacity, operator contracts and satellite. Use as a first look at dependence, not as a statement of what would happen.
Live Performance
56
measurements
7
probes
96
days monitored
235.7
ms avg RTT
0
anomalies
Monitored from 2026-07-11 through 2026-10-16 - live ICMP round-trip time measurements via our monitoring probes. All values below are recomputed daily from raw probe data. ✓ No anomalies detected in the monitored period.
The Chuuk-Pohnpei Cable is a submarine telecommunications cable linking the islands of Pohnpei and Weno in the Federated States of Micronesia. Spanning approximately 1,200 kilometers, the cable is owned by the Federated States of Micronesia Telecommunications Cable Corporation (FSMTCC) and has been listed as in service since 2019 according to GeoCables records. Publicly available sources do not disclose its design capacity, fiber pair count, supplier, or specific technological details, making it difficult to assess its full technical profile.
What stands out about the Chuuk-Pohnpei Cable is its role in connecting two key islands of Micronesia, enabling improved internet and communication services in a region where reliable connectivity is often challenging due to geographic isolation. While the cable's theoretical latency floor is known, live measurements of internet paths reveal significantly higher latencies, underscoring the complexity of end-to-end routing in global networks.
Quick facts
Length
1,200 km
Ready-for-service year
2019 (GeoCables database)
Owner
Federated States of Micronesia Telecommunications Cable Corporation (FSMTCC)
The Chuuk-Pohnpei Cable connects Pohnpei, an island in the eastern part of Micronesia, to Weno, the largest island in the Chuuk Lagoon. Pohnpei serves as a hub for other submarine cables, including the East Micronesia Cable System (EMCS), HANTRU1 Cable System, and IOKWE. This strategic location makes Pohnpei a critical node for regional connectivity. Weno, on the other hand, is the administrative center of Chuuk State and relies heavily on this cable for communication services.
The geography of the corridor presents challenges typical of the Pacific region, such as deep ocean trenches and volcanic activity. Submarine cable installation in such environments requires extensive marine surveys to map the seabed and avoid hazards. Once surveyed, cables are carefully laid using specialized vessels, with burial or armoring in areas prone to fishing activity or anchor drops. Repairs, if needed, involve deploying cable ships equipped with remotely operated vehicles (ROVs) to locate and fix faults, often under challenging conditions.
Why it was built and what it carries
The Chuuk-Pohnpei Cable was built to improve telecommunications infrastructure in Micronesia, addressing the need for reliable internet and voice services between the islands. Given the limited terrestrial connectivity options in the region, submarine cables are the primary means of linking distant island communities. The cable facilitates economic development, education, healthcare, and government operations by enabling faster and more dependable communication.
Micronesia's reliance on submarine cables reflects broader trends in the Pacific, where many island nations are investing in undersea infrastructure to bridge the digital divide. While the exact data capacity of the Chuuk-Pohnpei Cable is not publicly disclosed, its installation aligns with regional efforts to enhance connectivity.
History: what can be established
GeoCables data lists the Chuuk-Pohnpei Cable as ready for service in 2019. If industry sources suggest a different year, this discrepancy could result from delays in commissioning, differences in definitions of "ready for service," or reporting errors. Unfortunately, without corroborating documentation from FSMTCC or other stakeholders, the 2019 date cannot be independently verified.
Capacity and technology
Public sources do not disclose the design capacity, fiber pair count, supplier, or specific technological details of the Chuuk-Pohnpei Cable. This lack of transparency limits the ability to assess its performance or compare it to other regional cables. While modern submarine cables often employ dense wavelength division multiplexing (DWDM) technology to maximize capacity, attributing such specifics to this cable without documentation would be speculative.
Latency: the physics
The theoretical one-way latency for light propagation over the 1,200 km wet segment of the cable is approximately 5.9 milliseconds, with a round-trip time (RTT) floor of 11.8 milliseconds. Real-world measurements, however, show significantly higher RTTs due to additional factors such as land-based routing, terminal equipment, and internet traffic management. For instance, live internet path measurements to Weno from global locations range from 115.2 ms (Singapore) to 420.4 ms (Cape Town), reflecting the complexity of routing over interconnected networks.
Redundancy: what happens if it breaks
If the Chuuk-Pohnpei Cable experiences a fault, redundancy would depend on other cables landing in Pohnpei, such as the East Micronesia Cable System (EMCS), HANTRU1 Cable System, and IOKWE. These cables could potentially reroute traffic, but their capacity and configuration would determine how effectively they could compensate. Repairs would likely involve a cable ship dispatched to the fault location, a process that can take weeks depending on the severity of the damage and the availability of repair vessels.
Standard industry practices for cable repair include locating the fault using optical time-domain reflectometry (OTDR), recovering the damaged section, and splicing in new cable. Given the remote location of Micronesia, repair logistics could be complicated by long transit times for ships and equipment.
Bottom line
The Chuuk-Pohnpei Cable spans 1,200 km and connects Pohnpei and Weno in Micronesia.
Listed as ready for service in 2019, though corroborating industry sources are scarce.
Owned by FSMTCC, with no public disclosure of design capacity, fiber pairs, supplier, or technology.
Theoretical latency floor is 11.8 ms RTT over the wet segment, but real-world internet paths show much higher values.
Redundancy relies on other cables landing in Pohnpei, with repairs following standard submarine cable practices.