Sharpen your coral identification skills with these tips on how to ID grooved brain coral.

Hundreds of cuttlefish gather near Whyalla, South Australia, each year to mate in the world's largest cuttlefish aggregation.

Is the megalodon extinct? Here's what shark experts are saying about the movie "The Meg," which features an extinct prehistoric shark, megalodon.

Scientists from the California Academy of Sciences invented a tank to help bring fish up from great depths.

Things can get dicey for scuba divers when a sea lion takes a romantic interest in them underwater.

Sharpen your coral identification skills with these tips on how to ID pillar coral.

The Golden Triangle is a haven for hammerhead sharks. But these large pelagics are under a major threat to long-line fishing unless we help.

How do deep-diving cetaceans avoid DCS? Whales and dolphins have a special adaptation that allow them to explore the ocean's depths.

Learn more about these slimy fish with eight interesting facts about the moray eel.