Safety
The Blueprint still holds
In 1979 Sheck Exley looked at why cave divers died and found the same few mistakes again and again. More than forty years later, his list still explains most accidents.
Section
Safety
Managing the risks you chose to take
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Safety
Rule of thirds or minimum gas?
Two ways to decide how much gas to keep in reserve. One is simple and proven in caves. The other is calculated for the dive. Here's how each works, with a worked example.
Safety
Deep stops after the NEDU trial
For years, stopping deeper was thought to be safer. A 2011 US Navy trial challenged that, and decompression practice has been shifting since. What the evidence says, and what it doesn't.
Safety
Gas density: the limit you don't plan for
Most divers plan for oxygen and narcosis. Fewer plan for how thick their gas is at depth. Research published in 2016 suggests they should, especially on rebreathers.