Mariana-Guam Cable: latency up to 4.3× normal, 14 Apr 2026
What we measured
| Cable | Mariana-Guam Cable |
| Segment | Saipan, MP → Tanguisson Point, GU |
| Detected | 2026-04-14 05:01 UTC |
| Resolved | 2026-04-15 21:12 UTC |
| Duration | 1d 16h |
| Observed latency | 109.9 ms |
| Baseline | 25.6 ms · 4.31× |
| Increase | +331% |
| Severity | warning |
Who is affected
Countries where Mariana-Guam Cable 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 |
|---|---|---|---|
| Guam resilience index: 83 · resilient |
1 of 19 cables (5% of submarine diversity) | Apricot, Asia Connect Cable-1 (ACC-1), Asia-America Gateway (AAG) Cable System +15 more | median 297 ms today vs 264 ms over 30 days (59 routes) - unchanged |
| Northern Mariana Islands resilience index: 69 · moderate |
1 of 6 cables (17% of submarine diversity) | Atisa, Bulikula, Halaihai +2 more | average 6 ms over the last day vs 92 ms over 30 days - faster |
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. Other measurements did not confirm the event. We treat this as a probable false positive and label it as such.
Timeline
- Alert 2026041403: critical - ratio 4.31x
- Alert #74 manually resolved by admin
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.