Several Coast Guard cutters, the Honduran Navy and FBI dive teams then used side-sonar equipment to search for the sunken submarine-like vessel, which was located on July 26.

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''We locate objects on the sea bed with a side-scan sonar device which we tow along behind our salvage ship, '' she explained.

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The robot has eight sonar detectors as built-in obstacle detectors, in front, back, and side.

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