Police diving is a branch of professional diving carried out by police services. Police divers are usually professional police officers, and may either be employed full-time as divers or as general water police officers, or be volunteers who usually serve in other units but are called in if their diving services are required.
NYPD divers removing material from the Harlem Meer following a murder in the area few days prior.
Police divers in a river in Berlin
Dominica Marine police, maneuver under a Barbadian coast guard ship looking for an inert training explosive
Nesconset FD Scuba rescue team surface ice rescue training
Professional diving is underwater diving where the divers are paid for their work. Occupational diving has a similar meaning and applications. The procedures are often regulated by legislation and codes of practice as it is an inherently hazardous occupation and the diver works as a member of a team. Due to the dangerous nature of some professional diving operations, specialized equipment such as an on-site hyperbaric chamber and diver-to-surface communication system is often required by law, and the mode of diving for some applications may be regulated.
A US Navy diver at work. The umbilical supplying air from the surface is clearly visible.
Surface supplied commercial diving equipment on display at a trade show
A scientific diver at work
US Navy Clearance Divers defusing a MK17 Buoyant Mine