US deep-sea submarine gets makeover
Monday, July 2, 2012 - 17:00
in Earth & Climate
The crews rebuilding Alvin, the United States' deepest-diving manned vehicle, recently celebrated a significant milestone in the submersible's years-long upgrade with the unveiling of a newly tested titanium sphere that will one day ferry three people 21,325 feet (6,500 meters) deep into the ocean.