China’s New Deep-Sea Tool Can Secretly Cut Undersea Internet Cables

By: | March 28th, 2025

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China Develops a Game-Changing Underwater Tool

China has developed a deep-sea cable-cutting device that can sever undersea communication and power cables at depths of up to 4,000 meters. The China Ship Scientific Research Centre (CSSRC) and its State Key Laboratory of Deep-sea Manned Vehicles created this compact tool for use with advanced submersibles, both crewed and uncrewed, such as the Fendouzhe (Striver) and Haidou series.

How the Tool Cuts Through Extreme Depths

Engineers designed this device to withstand immense underwater pressure. At depths exceeding 400 atmospheres, its titanium alloy shell and oil-compensated seals prevent implosion, ensuring it operates reliably for extended periods.

Traditional cutting tools struggle against the steel-reinforced cables that carry about 95% of global data transmissions. To solve this, the CSSRC team built a 150mm diamond-coated grinding wheel that spins at 1,600 revolutions per minute. This high-speed rotation generates enough force to shatter steel while keeping underwater disturbances minimal.

A Civilian Tool with Military Implications

Chinese scientists claim they designed this tool for civilian applications, such as seabed mining and marine resource development. However, its ability to covertly sever undersea cables near strategic locations raises global security concerns. Disrupting these cables could impact global communications, financial transactions, and military operations.

Rising Global Tensions Over Undersea Cables

Recent incidents involving damaged data cables in regions like the Baltic Sea have intensified concerns about undersea infrastructure security. NATO and allied nations have responded by strengthening surveillance and intelligence-sharing efforts to prevent potential sabotage.

As China continues to advance its deep-sea exploration technology, the world is watching closely. While this tool promises new possibilities for undersea operations, its potential risks make it a subject of intense global scrutiny.

Nidhi Goyal

Nidhi is a gold medalist Post Graduate in Atmospheric and Oceanic Sciences.

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