SPHERES
'(<a href="http://www.j-archive.com/media/2008-05-02_J_25.jpg" target="_blank">Jimmy of the Clue Crew reports from the National Geographic Society's Explorers Hall.</a>) The National Geographic Society has a replica of this device that William Beebe invented & in which he descended to a record 3,028 feet off Bermuda in 1934'
a bathysphere