old white guys By heyakinbode 256 Eratosthenes ( bc ) Mar 4, 1394 Prince Henry the navigator Jan 7, 1480 Ferdinand Magellen Jan 7, 1490 Sonar made first by de vinvi Jan 17, 1706 Benjamin Franklin Nov 7, 1728 James cook Jan 14, 1806 Matthew Maury Jan 5, 1872 challenger expedition Jan 7, 1904 Pytheas ( bc ) Jan 7, 1928 Bathysphere 1928 was when it was first made Jan 7, 1990 Ptolemy
