Be truthful on your medical form, be fit to dive and practice your finning to avoid a snorkel accident.

Getting tangled in a buoy line sends a nervous diver over the edge, with disastrous results.

A cardiac event at depth highlights the importance of training for diving physically, not just mentally.

Complacency leads a diver to start a dive with only reserve gas. It does not take long for the dive to spin out of control.

Lying about plans and experience to get into a cave costs two divers their lives.

Descending despite discomfort becomes the ultimate disaster for one inexperienced diver.

A rusty diver gets entangled in kelp when task overload separates leads to buddy separation.

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.