On January 23, 1960, Swiss ocean explorer Jacques Piccard and U.S. Navy Lt.Don Walsh descended to the bottom of the Challenger Deep of the Marianas Trench (200 miles southwest of Guam), the deepest place on Earth, in a submersible named:
the 'Alvin' submersible
the 'Trieste' bathyscape
the Bathysphere
the 'Nautilus' submarine