Incident report · 2026032901
TPU cable: latency anomaly, 29 Mar 2026
Resolved · 5d 23h
What we measured
| Cable | TPU |
| Segment | Claveria, PH → Eureka, US |
| Detected | 2026-03-29 14:33 UTC |
| Resolved | 2026-04-04 14:01 UTC |
| Duration | 5d 23h |
| Observed latency | 44.3 ms |
| Baseline | 47.6 ms · 0.93× |
| Increase | +297% |
| Severity | warning |
Who is affected
Countries where TPU 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 |
| Philippines resilience index: 100 · resilient |
1 of 26 cables (4% of submarine diversity) | APCN-2, Apricot, Asia Connect Cable-1 (ACC-1) +22 more | median 284 ms today vs 244 ms over 30 days (102 routes) - slower |
| Taiwan resilience index: 100 · resilient |
1 of 21 cables (5% of submarine diversity) | APCN-2, Apricot, Asia Pacific Gateway (APG) +17 more | median 9 ms today vs 147 ms over 30 days (129 routes) - faster |
| 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 |
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 #28: warning - Eureka
- Alert #28 improving: 1/3 consecutive OK checks
- Alert #28 improving: 2/3 consecutive OK checks
- Alert #28 resolved: RTT 44.32ms (baseline 47.59ms)
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 2026032901: TPU. https://geocables.com/incident/2026032901
Embed this map
<iframe src="https://geocables.com/embed.php?type=map&id=tpu" width="640" height="420" frameborder="0" loading="lazy" style="border:0;border-radius:10px"></iframe>