An $8 million unmanned, deep-sea submarine is no longer with us, BBC reports. Named Nereus, the 6-year-old vehicle is suspected to have imploded while working under intense pressure during a 6000- to 11,000-meter dive in a trench just northeast of New Zealand. After losing contact with Nereus, researchers found remnants of the submarine floating on the ocean surface and are now working to learn more details about what happened to the sub.
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