Cambridge researchers said 72% to 92% of inter-country subsea cables must fail before over 10% of Bitcoin nodes disconnect. The study found targeted attacks on cable chokepoints are far more effective, with a 0.05 to 0.20 critical failure threshold. Researchers reported near-zero correlation between cable fault events and bitcoin price, with a coefficient of −0.02.
Starbucks also has good wifi at least in CA
update:
https://bitbo.io/news/subsea-cables-bitcoin-resilience/