Great Barrier Reef

Reef historian Iain McCalman, in Sydney, and reef scientist Stephen Palumbi, in California, are monitoring reef degradation from opposite sides of the planet. They compared notes.

The plight of sharks gets a human angle with a new documentary about a 20-year-old Australian activist who has been diving with these marine predators since childhood.

Researchers tracked wild tiger sharks in the Coral Sea, off the coast of Australia, to study patterns in the animals' migrations.

The amazing underwater images will help researchers measure the health of coral reefs, including the Great Barrier Reef.

Agency evaluates site before World Heritage Committee meeting next month.

Scientists shocked to see coral growing so far down.