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I spotted the activation of Tonga's cable at 5:56 UTC on 5 Aug 2013. As the graphic shows, the improvement in latency (from satellite to subsea cable) was huge.
In Jan 2019, the subsea cable serving Tonga suffered a fault and the island nation had to revert to satellite to maintain connectivity.
This hasn't happened today - either due to loss of power or technical failure of their comm systems.
UPDATE: According to @kentikinc data, internet traffic to/from Cuba continues to be erratic since two brief total blackouts beginning at 20:05 UTC (4:05pm local). #SoSCuba#KeepitOn
Zoomed-in view to better understand withdrawal timing.
- AS1299 begins withdrawing at 19:22 UTC
- AS2914 begins withdrawing at 19:33 UTC
- AS6939 had route withdrawn by 19:38 UTC
(cc: @JobSnijders)
To get a feel for how traffic changed globally during the outage, we can use this tool to look out incoming traceroutes to various content providers like these: