Incident report · 2026031605
Firmina cable: latency anomaly, 16 Mar 2026
Resolved · 23h 31m
What we measured
| Cable | Firmina |
| Segment | Montevideo, UY → São Paulo, BR |
| Detected | 2026-03-16 14:32 UTC |
| Resolved | 2026-03-17 14:04 UTC |
| Duration | 23h 31m |
| Observed latency | 26.8 ms |
| Baseline | 27 ms · 0.99× |
| Increase | +213% |
| Severity | warning |
Who is affected
Countries where Firmina 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 |
|---|---|---|---|
| Argentina resilience index: 70 · moderate |
1 of 8 cables (13% of submarine diversity) | ARSAT Submarine Fiber Optic Cable, Bicentenario, Malbec +4 more | median 270 ms today vs 214 ms over 30 days (96 routes) - slower |
| Brazil resilience index: 100 · resilient |
1 of 26 cables (4% of submarine diversity) | America Movil Submarine Cable System-1 (AMX-1), Brazilian Festoon, BRUSA +22 more | median 144 ms today vs 152 ms over 30 days (378 routes) - unchanged |
| Dominican Republic resilience index: 90 · resilient |
1 of 10 cables (10% of submarine diversity) | Alisios, America Movil Submarine Cable System-1 (AMX-1), Antillas 1 +6 more | average 227 ms over the last day vs 229 ms over 30 days - unchanged |
| United States resilience index: 100 · resilient |
1 of 122 cables (1% of submarine diversity) | ACS Alaska-Oregon Network (AKORN), AEC-1, Airraq +118 more | median 116 ms today vs 108 ms over 30 days (3282 routes) - unchanged |
| Uruguay resilience index: 44 · vulnerable |
1 of 4 cables (25% of submarine diversity) | Bicentenario, Tannat, Unisur | no measurement today; median 115 ms over 30 days (22 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
No usable traceroute data for this window.
Cross-probe verdict. The effect was confined to a narrow set of paths, so a cable-wide fault is unlikely.
Timeline
- Alert #24: warning - Santos
- Alert #24 resolved: Santos
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 2026031605: Firmina. https://geocables.com/incident/2026031605
Embed this map
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