Incident report · 2026100101
UK-Channel Islands-8 cable: latency up to 2.3× normal, 1 Oct 2026
Resolved · 2h 1m
What we measured
| Cable | UK-Channel Islands-8 |
| Segment | Goonhilly Downs, GB → St. Ouens Bay, JE |
| Detected | 2026-10-01 10:32 UTC |
| Resolved | 2026-10-01 12:34 UTC |
| Duration | 2h 1m |
| Observed latency | 11.8 ms |
| Baseline | 33.2 ms · 2.27× |
| Increase | +127% |
| 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 32 ms over the last day vs 26 ms over 30 days - slower |
| United Kingdom resilience index: 100 · resilient |
1 of 68 cables (1% of submarine diversity) | 2Africa, Amitie, Apollo +64 more | median 69 ms today vs 67 ms over 30 days (747 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 2026100101: warning - ratio 2.27x
- Alert #217 improving: 1/3 consecutive OK
- Alert #217 improving: 2/3 consecutive OK
- Alert #217 resolved: RTT 11.75ms (baseline 33.16ms), 4 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 2026100101: UK-Channel Islands-8. https://geocables.com/incident/2026100101
Embed this map
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