Watch a Tiny Blue Shark Dominate a 15-Foot Mako loading...
Watch a Tiny Blue Shark Dominate a 15-Foot Mako
What happens when there's suddenly food in the open ocean? Scientists set up an experiment in the remote southwestern Pacific to find out.
This Shark Eats Grass, and No One Knows Why loading...
This Shark Eats Grass, and No One Knows Why
The bonnethead shark's diet of seagrass has researchers stumped.
Mysterious Ghost Sharks' Sex Habits Revealed loading...
Mysterious Ghost Sharks' Sex Habits Revealed
Not only do males have retractable sex organs on their heads, females have a special place in their reproductive system for sperm.
Endangered Grey Nurse Shark Congregating Near Rainbow Beach loading...
Endangered Grey Nurse Shark Congregating Near Rainbow Beach
Large groupings have been spotted in a popular dive-site off Australia’s East Coast.
Why an 2.5-Metre Great White Shark Leapt Onto a Fishing Boat loading...
Why an 2.5-Metre Great White Shark Leapt Onto a Fishing Boat
One expert believes the story of a great white shark leaping unprovoked onto a small fishing boat, if true, would be highly unusual.
How do Animals Have Sex Underwater? loading...
How do Animals Have Sex Underwater?
Speed, angle, and agility combat the difficulties of aquatic mating.
Mysterious Shark Killer (Partially) Identified loading...
Mysterious Shark Killer (Partially) Identified
Scientists have discovered a surprising culprit behind a rash of shark strandings in California and elsewhere, but many questions remain.
These Sharks live to be 400 years old loading...
These Sharks live to be 400 years old
It is now the longest living vertebrate on the planet
These Sharks Thrive Inside an Underwater Volcano loading...
These Sharks Thrive Inside an Underwater Volcano
Scientists bring robots to the "Sharkcano" to better understand the harsh, mysterious place.
About the Show
In a remote corner of the South Pacific, National Geographic Explorer Enric Sala – one of the world’s leading marine ecologists – leads an elite team into an isolated underwater Eden. Sharks reign in the southern Line Islands, where humans rarely visit and survival is still of the fittest. Completing a daring survey of life on the reef from the micro to the mega, the research team uncovers secrets in what could be the last unspoiled archipelago on Earth. Covering nearly 3,300 kilometres on the 30-day expedition, the team faces a host of dangers – exposed to powerful currents and huge waves. What they find calls into question everything we know about a healthy reef ecosystem. Along the journey, they find over three times as much coral as any other reef in the Indo-Pacific on Flint Island. Surrounding Malden Island – the test site of three nuclear bombs in 1958 – the team finds a reef exploding with life and ten times more sharks than any other studied reef on the planet. Millennium Atoll offers a surprising refuge for blacktip reef sharks while Starbuck Island has the second largest biomass of any reef ever studied.

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