Incident report · 2026080502
High-capacity Undersea Guernsey Optical-fibre (HUGO): 0.62× baseline latency
Resolved · 1h 30m
What we measured
| Cable | High-capacity Undersea Guernsey Optical-fibre (HUGO) |
| Segment | Porthcurno, GB → Saints Bay, GG |
| Detected | 2026-08-05 21:02 UTC |
| Resolved | 2026-08-05 22:32 UTC |
| Duration | 1h 30m |
| Observed latency | 29.8 ms |
| Baseline | 48.3 ms · 0.62× |
| Increase | +141% |
| Severity | warning |
Who is affected
Countries where High-capacity Undersea Guernsey Optical-fibre (HUGO) 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: 97 · resilient |
1 of 34 cables (3% of submarine diversity) | 2Africa, Africa Coast to Europe (ACE), Africa-1 +30 more | median 59 ms today vs 59 ms over 30 days (9 routes) - unchanged |
| Guernsey resilience index: 53 · vulnerable |
1 of 5 cables (20% of submarine diversity) | Channel Islands-9 Liberty Submarine Cable, Guernsey-Jersey-4, INGRID +1 more | average 30 ms over the last day vs 29 ms over 30 days - unchanged |
| United Kingdom resilience index: 97 · resilient |
1 of 67 cables (1% of submarine diversity) | 2Africa, Amitie, Apollo +63 more | median 70 ms today vs 68 ms over 30 days (12 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 2026080502: warning - ratio 2.41x
- Alert #166 improving: 1/3 consecutive OK
- Alert #166 resolved: RTT 29.83ms (baseline 48.31ms), 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 2026080502: High-capacity Undersea Guernsey Optical-fibre (HUGO). https://geocables.com/incident/2026080502
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