At what depth does recreational diving typically become more hazardous?

Recreational diving typically becomes more hazardous around 30 meters (98 feet) due to several physiological and environmental factors. At this depth, divers face an increased risk of oxygen toxicity, nitrogen narcosis, and potential decompression sickness.

As divers descend beyond 30 meters, the partial pressures of gases inhaled from the tank change significantly. For instance, the increased partial pressure of nitrogen can lead to narcosis, which affects cognitive and motor functions, causing divers to make poor decisions. Furthermore, the increased pressure also heightens the risk of oxygen toxicity, particularly when using standard air as a breathing gas.

Another critical aspect at this depth is the need for more advanced diving skills and knowledge about decompression procedures. The likelihood of needing staged decompression upon ascent also increases, making dives at this depth more complex and requiring a higher level of training and preparation.

Overall, while diving can be done safely at this depth with proper training and precautions, the increase in potential hazards associated with the physiological effects of pressure makes 30 meters a critical depth in recreational diving.