Proa cable: latency up to 3.3× normal, 28 Oct 2026
What we measured
| Cable | Proa |
| Segment | Shima, JP → Tanguisson Point, GU |
| Detected | 2026-10-28 21:03 UTC |
| Duration | 5h 30m (ongoing) |
| Observed latency | 43.6 ms |
| Baseline | 69 ms · 3.26× |
| Increase | +226% |
| Severity | warning |
Who is affected
Countries where Proa 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 300 ms today vs 265 ms over 30 days (63 routes) - unchanged |
| Japan resilience index: 100 · resilient |
1 of 53 cables (2% of submarine diversity) | 5 Villages 6 Islands, APCN-2, Apricot +49 more | median 221 ms today vs 205 ms over 30 days (550 routes) - unchanged |
| Northern Mariana Islands resilience index: 69 · moderate |
1 of 6 cables (17% of submarine diversity) | Atisa, Bulikula, Halaihai +2 more | average 166 ms over the last day vs 96 ms over 30 days - 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
Traffic changed route while latency was elevated. A reroute of this kind usually follows a fault somewhere on the original path.
Cross-probe verdict. Our own cross-check concluded this was an operator reroute, not a cable fault. We publish it anyway, labelled as such.
Timeline
- Alert 2026102801: warning - ratio 3.26x
- Alert #240 improving: 1/3 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.