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[MUSIC]

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JOAN CARTAN-HANSEN, HOST: Not

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every archaeologist works in the

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soil.

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Some search for finds under the

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sea!

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Archaeologists first did

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underwater excavations to find

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artifacts in shallow waters.

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Scuba divers might search for a

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shipwreck or find artifacts

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tossed in the sea thousands of

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years ago.

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Underwater archaeologists use

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many of the same techniques used

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by their above-ground

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colleagues.

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They find a site and they mark

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the area to create a grid.

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Sometimes, objects are easy to

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find.

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Sometimes it takes special

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technology to find things.

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These scientists are

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investigating an underwater

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World War II battlefield.

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They use sonar to help identify

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wreckage.

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And then they take a manned

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submersible to search 800 feet

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below the surface.

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Once they get closer to objects

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not seen for decades, they take

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pictures and other data.

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So, they can make a computer

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model of the submarine and the

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ships they found.

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The hope is to learn how to

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preserve the site and how to

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teach others the history of this

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battle.

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For more information about

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archaeology, check out the

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Science Trek website.

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You'll find it at

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Sciencetrek.org