Breathing from the wrong gas supply didn't kill Sam — heart disease and obesity got him first. Another case study in our Lessons for Life dive training series.

Dive Training, Scuba Safety, and Dive Medicine: Dive better and safer by taking care of your noggin.

Is it carbon dioxide buildup, sinus trouble, tension or decompression illness that's crunching your skull?

In the low visibility of a busy river channel, one diver loses his way and his life.

In a hurry to be the first person on the wreck, an experienced diver makes a rookie mistake that costs him his life.

Bill ran the numbers and decided he could break one of tech diving's cardinal rules of safety. The numbers didn't lie, but they also didn't account for an unplanned emergency.

A series of avoidable mistakes claims the lives of two divers.