1472 Hand propelled Sub     1490 Leonardo da Vinci 1535 Diving bell used to explore sunken Roman galleys Lake Nemi, Italy, Guglielmo de Lorena     1538 Diving bell demonstrated by Greeks to Charles V Spain     1559 Samuel Champlain describes 70-foot dives by West Indians     1565 Turkish divers attack Malta, met by local divers     1580 William Bourne 1623 Cornelius Drebbel 1640 Diving bell used in wreck: Dieppe, France Jean Barrié     1643 Cossack 40-man cowhide submersibles attack Turkish ships: Black Sea     1660 Studies of physical properties of compressed air: England; Robert Boyle     1665 Diving Bell used in wreck: Tobermory, Scotland     1677 Arab divers employ bell on wrecks: Cadaqués Spain     1680 Giovanni Borelli 1687 Galleon treasure recovered by Indians and diving bell: Grand Bahama I.,William Phips     1726 Stephan Hale 1772 Doctor Fréminet 1773 Joseph Priestley 1774 J.F. Zölner 1809 Frederic de Drieberg 1823 Charles. A. Deane 1825 William H. James 1828 Charles en John Deane 1831 Charles Condert 1837 Siebe Gorman