What is a diving watch?
Some people will rely on their watch to accurately tell time deep underwater, and use the elapsed time mechanism to determine the remaining air time. Diving watches will have a unidirectional rotating bezel, which the wearer will turn when beginning the underwater descent. This will show him how much air time he has left, and when he needs to surface. The unidirectional turning bezel is important because if they are knocked out of position, they will only err on the caution side by reporting the diver must surface for air sooner, rather than later.
