More than 95% of the world’s data traffic — from financial transactions to AI computations — travels through a hidden network of underwater cables stretching nearly a million miles beneath the oceans.
Once used for telegraphs, today’s fiber-optic subsea cables form the backbone of the global internet and are becoming vital to the AI boom, as data-hungry systems link massive data centers across continents.
Investment is surging: between 2025 and 2027, subsea projects will attract an estimated $13 billion, nearly twice the amount invested in the previous three years. “Without subsea connectivity, AI infrastructure can’t function,” said Meta’s Alex Aime.
Tech giants are leading the charge. Meta’s Project Waterworth will span five continents as the world’s longest undersea cable, while Amazon’s Fastnet will link the U.S. and Ireland with record data speeds. Google and Microsoft are expanding their own networks, connecting their global AI and cloud systems.
However, the network’s fragility is a growing concern. Cable cuts — whether from accidents or possible sabotage — can cripple countries’ access to the internet. NATO’s “Baltic Sentry” mission was launched in 2025 to monitor subsea cables after incidents near Taiwan and the Baltic Sea.
In the U.S., the FCC has imposed stricter security standards, blocking direct connections to China and Russia and banning hardware from Huawei or ZTE.
Subsea cables are now not only infrastructure — they are strategic assets shaping the future of AI, global communication, and digital security.
