What's the story behind reefs' mysterious "halos" of empty sand?
A new study found that sea turtles born in areas most heated by climate change are 99.8 percent female.
Two-thirds of the length of the Great Barrier Reef is suffering from bleaching, a condition likely to cause mass coral die-offs.
More than 300,000 years ago, a behemoth undersea landslide sent huge amounts of debris sliding down the Great Barrier Reef, generating a 90-foot-high (27 meters) tsunami.
Australia's Great Barrier Reef corals are in trouble, with the northern part of the reef experiencing "the worst mass bleaching event in its history."
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.