Asia Direct Cable (ADC): latency up to 2.4× normal, 3 May 2026
What we measured
| Cable | Asia Direct Cable (ADC) |
| Segment | Tuas, SG → Maruyama, JP |
| Detected | 2026-05-03 19:01 UTC |
| Resolved | 2026-05-03 20:31 UTC |
| Duration | 1h 29m |
| Observed latency | 78.7 ms |
| Baseline | 104.2 ms · 2.35× |
| Increase | +135% |
| Severity | warning |
Who is affected
Countries where Asia Direct Cable (ADC) 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 |
|---|---|---|---|
| China resilience index: 100 · resilient |
1 of 24 cables (4% of submarine diversity) | APCN-2, Asia Africa Europe-1 (AAE-1), Asia Link Cable (ALC) +20 more | median 159 ms today vs 160 ms over 30 days (99 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 225 ms today vs 203 ms over 30 days (468 routes) - unchanged |
| 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 |
| Singapore resilience index: 78 · resilient |
1 of 46 cables (2% of submarine diversity) | APCN-2, Apricot, Asia Connect Cable-1 (ACC-1) +42 more | median 155 ms today vs 163 ms over 30 days (509 routes) - unchanged |
| Thailand resilience index: 100 · resilient |
1 of 18 cables (6% of submarine diversity) | Asia Africa Europe-1 (AAE-1), Asia Pacific Gateway (APG), Asia-America Gateway (AAG) Cable System +14 more | median 224 ms today vs 215 ms over 30 days (157 routes) - unchanged |
| Vietnam resilience index: 81 · resilient |
1 of 9 cables (11% of submarine diversity) | Asia Africa Europe-1 (AAE-1), Asia Link Cable (ALC), Asia Pacific Gateway (APG) +5 more | median 241 ms today vs 213 ms over 30 days (92 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
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 2026050302: warning - ratio 2.35x
- Alert #107 improving: 1/3 consecutive OK
- Alert #107 resolved: RTT 78.7ms (baseline 104.18ms), 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.