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Professional

It is fairly common for a national standard for commercial diver training and registration to apply within a country. These standards may be set by national government departments and empowered by national legislation, for example, in the case of the United Kingdom, where the standards are set by the Health and Safety Executive, and South Africa where they are published by the Department of Labour. Many national training standards and the associated diver registrations are recognised internationally among the countries which are members of the International Diving Regulators and Certifiers Forum (IDRCF). A similar arrangement exists for state-legislated standards, as in the case of Canada and Australia. Registration of professional divers trained to these standards may be directly administered by government, as in the case of South Africa, where diver registration is done by the Department of Labour, or by an approved external agent, as in the case of the Australian Diver Accreditation Scheme (ADAS) In the United States to become a dive master you must be approved by completing courses through a registered diving certifications agency, e.g. Professional Association of Diving Instructors (PADI).

The following countries and organisations are members of the European Diving Technology committee, which publishes minimum standards for commercial diver training and competence accepted by these and some other countries through membership of the IDRCF and IDSA: Austria, Belgium, Croatia, Czech Republic, Denmark, Estonia, Finland, France, Germany, Italy, Latvia, Romania, The Netherlands, Norway, Poland, Portugal, Spain, Slovak republic, Sweden, Switzerland, Turkey, United Kingdom, International Marine Contractors Association (IMCA), International Oil and Gas Producers (IOGP), International Transport Workers' Federation (ITF), International Diving Schools Association (IDSA), European Underwater Federation, and International Diving Regulators and Certifiers Forum (IDRCF). These standards include Commercial SCUBA Diver.

An example of a widely accepted training standard – EDTC 2017 Commercial SCUBA Diver – requires the professional scuba diver to be certified as medically fit to dive, and competent in skills covering the scope of:

International Diving Schools Association (IDSA) provides a Table of Equivalence of various national commercial diver training standards.

Military scuba training is usually provided by the armed force's internal diver training facilities, to their specific requirements and standards, and generally involves basic scuba training, specific training related to the equipment used by the unit, and associated skills related to the particular unit. The general scope of requirements is generally similar to that for commercial divers, though standards of fitness and assessment may differ considerably.

Canadian Association for Underwater Science (CAUS), The Scientific Committee of CMAS, Dive International Agency (DIA) and the American Academy of Underwater Sciences (AAUS) can give out Scientific scuba diving certifications. AAUS Scientific scuba diving certifications can only be achieved by taking an American Academy of Underwater Sciences (AAUS) course administered by a AAUS Organizational member (OM). Training for AAUS Scientific scuba diving certifications include a significantly higher level of training and proficiency not only in diving but in the use of scientific practices and operations, research and education. A diver would need a minimum of 100 hours of training, 12 required training dives, proof a Diver First Aid for Professional Divers (DFA Pro) certification and an application form with medical clearance. AAUS scientific diving certification does not imply AAUS membership, divers must actively join AAUS in order to join this community.