March 16, 2026 — The Bitcoin network demonstrates significant resilience to random undersea internet cable cuts, requiring nearly three-quarters of all intercontinental subsea cables to fail before experiencing major disruption, according to new research from the Cambridge Centre for Alternative Finance. The study, however, identifies targeted attacks on cable chokepoints as a far more effective threat.
Critical Failure Thresholds Identified
Researchers Wenbin Wu and Alexander Neumueller analyzed eleven years of Bitcoin peer-to-peer network data from 2014 through 2025. They examined 68 verified submarine cable fault events to model infrastructure resilience. Their paper, first published in February and last revised on March 12, represents the first longitudinal study of Bitcoin’s vulnerability to physical internet backbone failures.
The findings indicate a critical failure threshold for random cable removal between 0.72 and 0.92. This means 72% to 92% of all inter-country submarine cables must fail before more than 10% of Bitcoin network nodes disconnect. Subsea cables carry approximately 99% of international internet traffic.
Targeted Attacks Pose Greater Risk
While resilient to random failures, the network showed greater vulnerability to strategic strikes. The study found targeted attacks on specific subsea cable chokepoints to be an “order of magnitude more effective.” For such coordinated actions, the critical failure threshold drops dramatically to between 0.05 and 0.20.
This highlights a security asymmetry. Bitcoin’s decentralized design protects against widespread random infrastructure damage but remains susceptible to precise attacks on key physical internet junctions. The research suggests that understanding cable topology is more important for resilience than tracking the geographic distribution of Bitcoin mining hashpower.
Tor Routing Enhances Network Strength
The study also examined the role of The Onion Router (Tor) in bolstering Bitcoin’s defenses. Tor obfuscates node locations by routing traffic through a global chain of volunteer-run servers. Researchers found that 64% of Bitcoin nodes are essentially “invisible” due to Tor adoption.
“Tor adoption increases resilience under current relay geography rather than introducing hidden fragility,” the paper stated. This resilience stems from the concentration of Tor relay infrastructure in Germany, France, and the Netherlands. These nations possess extensive and redundant submarine cable connectivity, making relay capacity resistant to cable failures.
Minimal Impact on Price and Nodes
Historical analysis revealed that 87% of the 68 cable fault events caused less than a 5% impact on Bitcoin nodes. Furthermore, cable disruptions showed essentially zero correlation with Bitcoin’s price. The statistical correlation coefficient was a negligible -0.02.
The geographic diversification of Bitcoin mining over the past decade has not materially altered this infrastructure resilience profile. Network stability remains tied more closely to the physical layout of global internet cables than to the shifting locations of mining operations.
For more information on global submarine cable infrastructure, visit the authoritative TeleGeography Submarine Cable Map. The Cambridge Centre for Alternative Finance provides access to its published research on digital assets.
This article was produced with AI assistance and reviewed by our editorial team for accuracy and quality.
