Incident report · 2026101101
Medusa Submarine Cable System: latency up to 5.1× normal, 11 Oct 2026
Resolved · 2h 55m
What we measured
| Cable | Medusa Submarine Cable System |
| Segment | Tartous, SY → Carcavelos, PT |
| Detected | 2026-10-11 03:08 UTC |
| Resolved | 2026-10-11 06:03 UTC |
| Duration | 2h 55m |
| Observed latency | 81.5 ms |
| Baseline | 111.8 ms · 5.08× |
| Increase | +408% |
| Severity | critical |
Who is affected
Countries where Medusa Submarine Cable System 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 |
|---|---|---|---|
| Algeria resilience index: 88 · resilient |
1 of 7 cables (14% of submarine diversity) | Africa-1, Alpal-2, Med Cable Network +3 more | average 49 ms over the last day vs 53 ms over 30 days - unchanged |
| Cyprus resilience index: 88 · resilient |
1 of 15 cables (7% of submarine diversity) | Blue, CADMOS, CADMOS-2 +11 more | no measurement today; median 36 ms over 30 days (8 routes) |
| Egypt resilience index: 100 · resilient |
1 of 25 cables (4% of submarine diversity) | 2Africa, Africa-1, Aletar +21 more | no measurement today; median 135 ms over 30 days (58 routes) |
| France resilience index: 100 · resilient |
1 of 35 cables (3% of submarine diversity) | 2Africa, Africa Coast to Europe (ACE), Africa-1 +31 more | median 61 ms today vs 71 ms over 30 days (636 routes) - unchanged |
| Greece resilience index: 100 · resilient |
1 of 21 cables (5% of submarine diversity) | 2Africa, Adria-1, ANDROMEDA +17 more | median 88 ms today vs 70 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 164 ms today vs 80 ms over 30 days (348 routes) - slower |
| 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 187 ms today vs 185 ms over 30 days (7 routes) - unchanged |
| Malta resilience index: 70 · moderate |
1 of 8 cables (13% of submarine diversity) | Epic Malta-Sicily Cable System (EMSCS), GO-1 Mediterranean Cable System, Italy-Malta +4 more | no measurement today; median 92 ms over 30 days (22 routes) |
| Morocco resilience index: 92 · resilient |
1 of 8 cables (13% of submarine diversity) | Atlas Offshore, Canalink, EllaLink +4 more | no measurement today; median 109 ms over 30 days (44 routes) |
| Portugal resilience index: 100 · resilient |
1 of 21 cables (5% of submarine diversity) | 2Africa, Africa Coast to Europe (ACE), Azores Fiber Optic System (AFOS) +17 more | median 91 ms today vs 88 ms over 30 days (603 routes) - unchanged |
| Spain resilience index: 100 · resilient |
1 of 39 cables (3% of submarine diversity) | 2Africa, Africa Coast to Europe (ACE), Almería-Melilla (ALME) +35 more | no measurement today; median 81 ms over 30 days (294 routes) |
| Syria resilience index: 49 · vulnerable |
1 of 6 cables (17% of submarine diversity) | Aletar, BERYTAR, Ebla +2 more | average 58 ms over the last day vs 54 ms over 30 days - unchanged |
| Tunisia resilience index: 52 · vulnerable |
1 of 6 cables (17% of submarine diversity) | Didon, HANNIBAL System, PEACE Cable +2 more | no measurement today; median 73 ms over 30 days (8 routes) |
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. Too few independent vantage points were watching this endpoint to reach a cross-probe verdict.
Timeline
- Alert 2026101101: critical - ratio 5.08x
- Alert #224 improving: 1/3 consecutive OK
- Alert #224 improving: 2/3 consecutive OK
- Alert #224 resolved: RTT 81.48ms (baseline 111.75ms), 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 2026101101: Medusa Submarine Cable System. https://geocables.com/incident/2026101101
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