HOV Alvin, the U.S. Navy operated research submersible plunges deeper than ever thanks to a $50 million upgrade that allows the submersible to dive to depths of 6500 meters deep. With its thicker titanium hull and stronger seals, HOV Alvin can now reach 99% of the ocean bottom.
ALT Photo Credit: HANNAH PIECUCH/WOODS HOLE OCEANOGRAPHIC INSTITUTION