Iran’s Undersea Cable Attack Could Cripple Global Internet and $10 Trillion Daily Flows After Hormuz Blockade

Why It Matters

A cable outage would cripple global commerce, cloud services, and military communications, forcing reliance on limited satellite bandwidth and destabilizing markets. The threat highlights a strategic blind spot in international law and the urgent need for coordinated cable‑security measures.

Key Takeaways

• More than 20 critical cables cross the Strait of Hormuz.
• $10 trillion in daily financial flows travel via submarine cables.
• Iran can disrupt cables with low‑cost, high‑impact attacks.
• Recent Red Sea cuts highlight vulnerability of regional cable networks.
• No international treaty currently governs undersea cable security.

Pulse Analysis

Undersea fiber‑optic cables are the invisible arteries of the digital economy, moving 99 % of international data and underpinning everything from high‑frequency trading to cloud‑based health records. Their capacity to transmit roughly $10 trillion in daily financial transactions makes them as valuable as any physical commodity, and any interruption reverberates instantly across markets, supply chains, and consumer services worldwide. For businesses, the reliability of these links determines latency, transaction speed, and the ability to scale digital operations across continents.

Iran’s geographic foothold on the northern shore of the Strait of Hormuz gives it a uniquely low‑cost, high‑impact lever to threaten this infrastructure. Past incidents—such as the September 2025 Red Sea cable damage and the February 2024 cuts blamed on Houthi proxies—demonstrate how quickly a few meters of severed fiber can degrade internet speeds from Mumbai to Frankfurt, delay cross‑border settlements, and force military commands like US CENTCOM onto congested satellite channels. The prospect of a deliberate Iranian strike adds a geopolitical dimension to an already fragile asset, potentially prompting emergency rerouting and costly bandwidth purchases.

Despite the clear risks, there is no binding international regime governing undersea cable protection. Proposals for “cable protection zones,” mandatory vessel disclosures, and rapid‑attribution mechanisms have stalled amid competing interests of the United States, China, Russia, India, and regional powers. Companies can mitigate exposure by diversifying routing paths, investing in terrestrial backup links, and monitoring real‑time cable health services. Ultimately, a multilateral treaty that criminalizes intentional sabotage and establishes clear enforcement protocols is essential to safeguard the digital lifelines that sustain the global economy.