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MEXICO CITY (AP) - U.S. researchers have begun testing an underwater robot at a Mexican sinkhole lake as part of a NASA-funded project to develop techniques for exploring possible signs of life on other planets.
The bright orange, bubble-shaped vehicle was lowered Tuesday into the Zacaton lake in the Gulf coast state of Tamaulipas, which at about 1,000 feet deep is believed to be the world's deepest sinkhole.
It is designed to sense, adapt to and investigate its surroundings — without being connected to its operators — and is equipped with sonar sensors.
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