Caribbean's Deadly Underworld

Life is anything but tranquil underneath the crystal waters of the Caribbean. Massive sharks and alien life-forms thrive along a line of hidden faults and volcanoes that could give way at any moment, engulfing coastlines from Puerto Rico to New York. Dive deep below the sea with renowned ocean explorer Robert Ballard as he leads a team of scientists on a daring three-month deep-sea expedition in an attempt to examine these potential hazards like never before. (Source: National Geographic Wild)