What is the maximum recommended depth for recreational divers without special gas mixtures?

The maximum recommended depth for recreational divers using air without special gas mixtures is typically 30 meters (100 feet). This limit is established to enhance diver safety and reduce the risk of decompression sickness and nitrogen narcosis. At this depth, divers can generally conduct most recreational diving activities while still having a reasonable safety margin for ascent rates and decompression stops if necessary.

Exceeding this depth, such as going down to 40 meters (131 feet) or deeper, requires more specialized training and equipment due to factors such as increased nitrogen absorption, which raises the risk of decompression illness, and the effects of narcosis, which can impair judgment and coordination. Staying within the 30-meter limit allows divers to enjoy a safe and fun diving experience without needing advanced gas mixtures or extensive decompression planning.