A liveaboard diver maxes out his bottom time for days in a row, landing him in the hospital with decompression sickness. His dive buddy experiences no symptoms, showing why it’s best to dive conservatively — you never know how your body will react.

A diver ignores a DCS symptoms, including a rash—an increasingly common sign of being bent.

Early-onset Alzheimer's complicates — but can't stop — diving for this determined diver and her loving husband.

The PADI Divemaster course is a starting point for many scuba diving jobs. It covers the physics and physiology of diving to in-water safety, diver supervision and the business of diving.

Learn where nudibranchs live and aim for a super macro shot that highlights the sea slug’s unique features.

Tips to prepare the kids and teens in your life to become divers, and what should you look for in the dive center or trip operator you choose for their journey.

No, whale sharks' eyeballs are not covered in miniature teeth. Here's what the discovery of dermal denticles in a whale sharks eyes actually means.

In this edition of Ask a Marine Biologist, Dr. David Shiffman proves that sharks are far more than mindless killing machines.

Experienced cave diver details what it's like to discover new cave lengths and set the record for the longest dive into an underwater cave without resurfacing.