Incident report · 2026031302
FLAG Atlantic-1 (FA-1) cable: latency anomaly, 13 Mar 2026
Resolved · 59m
What we measured
| Cable | FLAG Atlantic-1 (FA-1) |
| Segment | London, GB → London, GB |
| Detected | 2026-03-13 16:32 UTC |
| Resolved | 2026-03-13 17:32 UTC |
| Duration | 59m |
| Observed latency | 62.2 ms |
| Baseline | 116.1 ms · 0.54× |
| Increase | +-47% |
| Severity | warning |
Who is affected
Countries where FLAG Atlantic-1 (FA-1) comes ashore, how much of their submarine diversity this cable represents, and what our measurements into them show.
| Country | Dependence on this cable | Other submarine cables | What the measurements show |
|---|---|---|---|
| France resilience index: 100 · resilient |
1 of 35 cables (3% of submarine diversity) | 2Africa, Africa Coast to Europe (ACE), Africa-1 +31 more | median 67 ms today vs 71 ms over 30 days (666 routes) - unchanged |
| United Kingdom resilience index: 100 · resilient |
1 of 68 cables (1% of submarine diversity) | 2Africa, Amitie, Apollo +64 more | median 103 ms today vs 74 ms over 30 days (1011 routes) - slower |
| United States resilience index: 100 · resilient |
1 of 122 cables (1% of submarine diversity) | ACS Alaska-Oregon Network (AKORN), AEC-1, Airraq +118 more | median 116 ms today vs 108 ms over 30 days (3282 routes) - unchanged |
Dependence is structural (share of the country's submarine cables), not a traffic share: real traffic distribution across cables is not public.
Path analysis
No usable traceroute data for this window.
Cross-probe verdict. Too few independent vantage points were watching this endpoint to reach a cross-probe verdict.
Timeline
- Alert #8: warning - Cayeux-sur-Mer
- Alert #8 resolved: Cayeux-sur-Mer
Detection method
Latency is sampled continuously from our probe network. An alert opens when round-trip time to a monitored endpoint holds above its rolling baseline, and closes automatically once it returns. Full method is described on the methodology page.
How to cite
GeoCables (2026). Incident 2026031302: FLAG Atlantic-1 (FA-1). https://geocables.com/incident/2026031302
Embed this map
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