After a post-Cold War hiatus, navies across the planet are pursuing new anti-submarine capabilities as a submarine arms race accelerates in the Pacific Ocean. Developing technologies like quantum magnetometers and satellite-based optical sensors are leading to forecasts that submarines may be on the verge of losing their stealthy edge by the mid-twenty-first century.

But swarms of cheap drones both above and below the water (unmanned underwater vehicles, or UUVs) may pose the biggest and most proximate threat to submarines.

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