What is "nitrogen narcosis"?

Nitrogen narcosis occurs when a diver experiences a state of altered consciousness due to the effects of breathing nitrogen under high pressures, typically at depths greater than 30 meters (around 100 feet). As divers descend, the partial pressure of nitrogen increases, leading to a narcotic effect that can impair judgment, coordination, and reaction time, similar to the effects of alcohol. This phenomenon is significant for divers as it can affect their ability to make sound decisions while underwater.

The other options describe different conditions that divers might encounter but do not accurately reflect the specific nature of nitrogen narcosis. Low oxygen levels lead to hypoxia, increased carbon dioxide results in hypercapnia, and decompression illness relates to the formation of gas bubbles upon ascent rather than the narcotic effects of nitrogen. Understanding nitrogen narcosis is crucial for safe diving practices, particularly at greater depths.