What is the deepest a person can dive?
How deep you go only depends on your threshold for risk, and the purpose of the dive.
An amateur recreational diver should stay under 100 feet. If you're using tables, you will find that a 100-foot dive is over rather quickly!
The safe limit for a trained expert diver should be around 200 feet - even at depths under 200 feet, the partial pressure of nitrogen becomes toxic, and nitrogen narcosis is a danger. Most divers, even professional divemasters, would never be compelled to go past 220 feet.
Professional divers such as underwater welders will often work at depths below 200 feet, but they do so only with special safety precautions and depressurizing chambers.
The free diving record is somewhere around 450 feet. Ultimately, deep diving becomes competitive, and extremists tend to get macho about deep diving. But there is a point where a competitive nature becomes lethal.
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