. >> reporter: clara nobles is tht assit director of the alabama historical commission. w it teamed h delgado's company, called search, inc., the national geographic society and other groups to do a full-scale assessment of a section of the mobile river, to see what all lneath these muddy waters. >> you can't see your hand in front of your face, so we use the sonar to get a clearer picte. team also used magnetometers, which he desibes as "fancy metal detectors," and something called a sub-bottom profiler to detect objects beneath the mud. >> we're diving and mapping things by feel. in some cases, we're taking wo samples to understand if it's... if it's a wooden ship, what it's built of. >> reporter: delgado is nowg analyze data to figure out what they found. he says the bay and river are litted with shipwrecks, everything from barges to armored civil war gunboats. >> and perhaps somewhere in that graveyard, "clotilda" might be found. >> reporter: clara nobles says finding the "clotilda" would be monuntal, but it's just one piece of a much more important story. >> as we c