Baltic Sea Submarine Cable: 1.74× baseline latency
What we measured
| Cable | Baltic Sea Submarine Cable |
| Segment | Helsinki, FI → Stockholm, SE |
| Detected | 2026-05-15 03:01 UTC |
| Resolved | 2026-05-15 04:31 UTC |
| Duration | 1h 29m |
| Observed latency | 78.6 ms |
| Baseline | 45.1 ms · 1.74× |
| Increase | +127% |
| Severity | warning |
Who is affected
Countries where Baltic Sea Submarine 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 |
|---|---|---|---|
| Estonia resilience index: 80 · resilient |
1 of 8 cables (13% of submarine diversity) | E-FINEST, Finland Estonia Connection 1 (FEC-1), Finland Estonia Connection 2 (FEC-2) +4 more | median 66 ms today vs 65 ms over 30 days (6 routes) - unchanged |
| Finland resilience index: 100 · resilient |
1 of 15 cables (7% of submarine diversity) | BCS North - Phase 1, BCS North - Phase 2, Botnia +11 more | no measurement today; median 55 ms over 30 days (10 routes) |
| Sweden resilience index: 100 · resilient |
1 of 29 cables (3% of submarine diversity) | Baltica, BCS East-West Interlink, BCS North - Phase 1 +25 more | median 68 ms today vs 71 ms over 30 days (42 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. Only one probe saw it. We treat this as a probable false positive and label it as such.
Timeline
- Alert 2026051502: warning - ratio 2.27x
- Alert #120 improving: 1/3 consecutive OK
- Alert #120 resolved: RTT 78.58ms (baseline 45.07ms), 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.