Comparing sonar images with photographs can help technicians identify what they are seeing, as can data from magnetometers.

The cascabel (a rounded projection behind the breech of the gun) is on the other end. Comparing sonar images with photographs can help technicians identify what they are seeing, as can data from magnetometers (instruments that detect the presence of iron and/or steel). Images Courtesy of Rod Mather, University of Rhode Island.

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