Since antiquity, people descend into depths of the sea on breath-hold. At the beginning, diving existed only in order to exploit natural resources as well as for military purposes. Over time, the development of technology brought newer and newer inventions allowing to extend time spent underwater. However, only the invention of SCUBA popularized diving as recreational activity. Man under water is a remarkable object for underwater photographer. Starting with the most accessible diving buddy, you can find a lot of interesting scenes in which people are playing a major role; apnea divers, commercial divers at work, UW-models etc.