Silphium: 0.87× baseline latency
What we measured
| Cable | Silphium |
| Segment | Chania, GR → Derna, LY |
| Detected | 2026-04-22 23:01 UTC |
| Resolved | 2026-04-23 00:32 UTC |
| Duration | 1h 30m |
| Observed latency | 144.9 ms |
| Baseline | 165.8 ms · 0.87× |
| Increase | +103% |
| Severity | warning |
Who is affected
Countries where Silphium 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 |
|---|---|---|---|
| Greece resilience index: 97 · resilient |
1 of 21 cables (5% of submarine diversity) | 2Africa, Adria-1, ANDROMEDA +17 more | median 90 ms today vs 91 ms over 30 days (6 routes) - unchanged |
| Libya resilience index: 84 · resilient |
1 of 6 cables (17% of submarine diversity) | Europe India Gateway (EIG), Italy-Libya, LFON (Libyan Fiber Optic Network) +2 more | median 182 ms today vs 181 ms over 30 days (6 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
Traffic kept the same route. Latency rose without a visible path change, which points at congestion or a fault on the existing route rather than a reroute.
Cross-probe verdict. The effect was confined to a narrow set of paths, so a cable-wide fault is unlikely.
Timeline
- Alert 2026042201: warning - ratio 2.03x
- Alert #90 improving: 1/3 consecutive OK
- Alert #90 resolved: RTT 144.87ms (baseline 165.82ms), 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.