Join Dr. Bob Ballard as he prepares two deep sea subs to enter an undersea volcano.
(02:44)Dr. Bob Ballard is diving to extreme depths to explore a volcano; this time he is not alone.
(03:00)Dr. Ballard visits breath-taking sites like volcanoes submerged beneath the Hawaiian islands, to...
Cameras catch never-before-seen rock formations, lava vents, and unusual species that call the...
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