Learn how to identify the boulder brain coral, or *Colpophyllia Natans*, underwater with these ID tips.

With the threat of coral bleaching, crown-of-thorns starfish and climate change, the Great Barrier Reef needs help and Australians are answering the call.

Think you know sharks? This divers guide to sharks includes species like hammerheads, great white, whale sharks and other apex predators from across the globe.

A pod of orcas, or killer whales, delighted freedivers off the coast of Cabo San Lucas, Mexico. The divers snapped some amazing photos and video of the rare encounter.

The Florida Fish and Wildlife Conservation Commission, FWC, upheld a ban on fishing the endangered goliath grouper, rejecting a limited harvest of the fish.

Scuba divers should respect these sometimes aggressive marine creatures that can sting, bite or snap if provoked.

The best dive destinations with no scuba tank required. Swim with whales in Norway, Tonga and Sri Lanka or grab your freediving gear and head to Australia to dive with fur seals.

Strengthen your marine-ID skills by learning how to identify the most common coral species.

Coral expert Nicole Helgason will write a regular column for *Scuba Diving* magazine helping you improve your coral identification skills.