Workers testing underwater surveying equipment say they found the wreckage of a small airplane deep underwater in California's Folsom Lake - and they may have solved a 56-year-old aviation mystery.Sonar images show the outline of the plane, covered in a thick layer of silt, about 49 metres below the lake's surface, Seafloor Systems environmental technician Jeff Riley told CNN.Riley said they first realised that something might be down there when they were going through data that his colleague Tyler Atkinson had collected while testing a small, unmanned surveying boat.
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