Which condition is essential for a squeeze to occur?

A squeeze occurs specifically in an enclosed space where the pressure inside the space decreases or the volume of the enclosed space increases while external pressure remains higher. This can lead to a situation where the surrounding water pressure causes a force on the body, often affecting air-filled spaces like the lungs or sinuses, resulting in discomfort or injury.

In an open water environment, external pressure equalizes with internal pressure via the body’s natural mechanisms, thus preventing a squeeze from occurring. Increased buoyancy or hypothermic conditions do not contribute directly to the phenomenon of a squeeze, as they relate more to buoyancy control or temperature regulation rather than pressure imbalance in an enclosed space. Understanding these dynamics is critical for safe diving practices.