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.

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.

A close call drills important safety lessons into the head of one lucky diver. Next time, he'll follow instructions. After reading his story, you will too.

Ill-prepared for ocean currents, an out-of-shape diver panics with fatal results.

Two divers follow a divemaster beyond the level of their training. Only one comes back.

Two lobster divers ascend from a dive to find their boat is nowhere in sight.