At what depth do most divers experience narcosis according to common knowledge?

Most divers commonly experience narcosis, also known as nitrogen narcosis, starting at depths around 100 feet, or approximately 30 meters. At this depth, the increased partial pressure of nitrogen due to the surrounding water creates an effect similar to intoxication, impacting the diver's cognitive abilities and motor skills.

While some divers may begin to notice mild symptoms of narcosis at shallower depths, the onset is not universally consistent and can vary based on individual susceptibility, dive conditions, and how quickly one descends. Understanding that narcosis can occur even at depths as shallow as 30 to 40 feet emphasizes the importance of awareness and careful monitoring of oneself and dive partners while deep diving. The effects tend to become more pronounced as the depth increases, making 100 feet a critical threshold where divers must be particularly vigilant.

Transcending this common depth threshold serves as a reminder for divers to prioritize safety and adhere to dive tables, ensuring that they are setting appropriate dive plans that include the potential effects of narcosis.