Alvin is a little three-man submarine commissioned...  ...is a little three-man submarine commissioned for ocean exploration and launched in June of 1964. It is the only su...  ...hours—more than 1,300 days—under the ocean 's surface, with an average dive length of nearly...  ...ne pilot and two sc...

This adorable purple octopus, possibly a young...  ...a ROV (remotely operated vehicle) to explore the ocean as far down as 9,800 feet, or 3,000 meters. See p...  ...phic. Link (Image credit: Bedford Institute of Oceanography )