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Shark Trackers
Overcoming his fears, Alan places a radio transmitter on a 13-foot tiger shark, and learns that these creatures need to swim to breathe.


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Hidden Depths
A remote sub dives to the unexplored middle depths of the ocean off Monterey, California, revealing a spectacular variety of new life forms.


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Shell Game
Evolutionary biologist Gary Vermeij, blind since childhood, uses his highly developed sense of touch to understand how change comes to marine shells.


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Spineless But Smart
Research with octopuses proves that even invertebrates can learn through observation.


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Whale Rescue
A marine biologist saves whales and fishermen's valuable nets by designing an alarm that alerts whales, but not fish, to the presence of the net.


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