Incident report · 2026040301
Ionian cable: latency anomaly, 3 Apr 2026
Resolved · 1h 27m
What we measured
| Cable | Ionian |
| Segment | Preveza, GR → Crotone, IT |
| Detected | 2026-04-03 04:34 UTC |
| Resolved | 2026-04-03 06:02 UTC |
| Duration | 1h 27m |
| Observed latency | 83.3 ms |
| Baseline | 83.6 ms · 1× |
| Increase | +287% |
| Severity | warning |
Who is affected
Countries where Ionian 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: 100 · resilient |
1 of 21 cables (5% of submarine diversity) | 2Africa, Adria-1, ANDROMEDA +17 more | median 85 ms today vs 67 ms over 30 days (71 routes) - slower |
| Italy resilience index: 100 · resilient |
1 of 38 cables (3% of submarine diversity) | 2Africa, ANDROMEDA, Asia Africa Europe-1 (AAE-1) +34 more | median 94 ms today vs 81 ms over 30 days (374 routes) - slower |
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 #38: warning - Crotone
- Alert #38 resolved: Crotone
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 2026040301: Ionian. https://geocables.com/incident/2026040301
Embed this map
<iframe src="https://geocables.com/embed.php?type=map&id=ionian" width="640" height="420" frameborder="0" loading="lazy" style="border:0;border-radius:10px"></iframe>