Tragedy strikes when a diver forgets to watch his air levels while helping his buddy capture underwater photos.

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.

An experienced diver with signs of DCS doesn’t immediately respond to treatment—what’s going on here?

Even areas designated for diving aren't risk-free, so dive defensively, flying a dive flag, and get first aid training.

An inexperienced freediver tries to push his limits, putting himself and his dive buddy at risk of drowning.

This fire department volunteer diver made several mistakes in this edition of Lessons for Life.

An undiagnosed PFO adds to the perfect conditions for a post-dive incident in this edition of Lessons for Life.

Flying after diving complicates decompression illness, especially if a diver has untreated DCI symptoms.