Incident report · 2026092802
UK-Channel Islands-8 cable: latency up to 2.5× normal, 28 Sep 2026
Resolved · 1h 29m
What we measured
| Cable | UK-Channel Islands-8 |
| Segment | Goonhilly Downs, GB → St. Ouens Bay, JE |
| Detected | 2026-09-28 15:02 UTC |
| Resolved | 2026-09-28 16:32 UTC |
| Duration | 1h 29m |
| Observed latency | 10.7 ms |
| Baseline | 31.3 ms · 2.45× |
| Increase | +160% |
| Severity | warning |
Who is affected
Countries where UK-Channel Islands-8 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 |
|---|---|---|---|
| Jersey resilience index: 42 · vulnerable |
1 of 3 cables (33% of submarine diversity) | Guernsey-Jersey-4, INGRID | average 35 ms over the last day vs 22 ms over 30 days - slower |
| United Kingdom resilience index: 97 · resilient |
1 of 67 cables (1% of submarine diversity) | 2Africa, Amitie, Apollo +63 more | median 73 ms today vs 65 ms over 30 days (627 routes) - unchanged |
Dependence is structural (share of the country's submarine cables), not a traffic share: real traffic distribution across cables is not public.
Timeline
- Alert 2026092802: warning - ratio 2.45x
- Alert #212 improving: 1/3 consecutive OK
- Alert #212 resolved: RTT 10.72ms (baseline 31.26ms), 3 consecutive OK
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 2026092802: UK-Channel Islands-8. https://geocables.com/incident/2026092802
Embed this map
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