In the interconnected fabric of the 21st-century world, undersea cables are the invisible arteries that keep the global internet, finance, and defense communications flowing. A recent technological leap from China—its development of a deep-sea cable-cutting device, deployable by submersibles and effective at depths up to 4,000 meters—has jolted military planners, industry leaders, and cyber defenders alike. This groundbreaking capability, capable of slicing through even armored cables at depths well beyond most current infrastructure, marks a turning point in undersea warfare and underscores the urgency for nations to act.
