St. Brendan striking out into the Atlantic - about 6th Century A.D.
St. Brendan checking depths with his sounding pole
Image ID: theb2122, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection
Photo Date: 500 A.D.
Credit: NOAA Central Library
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of the U.S. Department of Commerce, National Oceanic & Atmospheric
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July 7, 2015