and health in professional diving When professional diving is done within territorial waters, the operations generally fall under national or state diving regulations, often with associated Codes of practice. In some cases exemptions from regulations may apply, such as for public safety diving in the US where a rescue is intended, or scientific diving in the US, where the diving follows an accepted code of practice approved by the American Association for Underwater Science (AAUS). For work outside national territorial waters, where health and safety regulations do not apply, diving contractors may choose to work under codes of practice of voluntary industry membership organisations, like the Association of Diving Contractors International (ADCI) and International Marine Contractors Association (IMCA) International Code of Practice for Offshore Diving. These regulations or their codes of practice define the minimum support personnel in the dive team based on the mode of diving, and require the diving contractor to follow standard operating procedures laid out in their company operations manual, or use procedures drawn up specifically for the job. Members of a professional diving team will usually include at least a working diver, a diving supervisor, and a stand-by diver. If the divers are using surface supplied breathing equipment, a diver's attendant would be required for each diver. Use of a diving bell would require a bellman. If a chamber is required on site, a chamber operator is required. When breathing gases may be switched, a Gas man will be needed to operate the gas panel. In remote locations, a diver medical technician and a diving systems technician may be required. At least two life support technicians are required to run a saturation system, as it must be monitored 24 hours a day. Regulations or codes of practice may also require the appointment of specific personnel with responsibilities for various aspects of occupational safety,such as a diving safety officer for an organisation doing scientific diving, a diving superintendent at an offshore installation where various diving contractors may be employed, a health and safety representative, or a contracted diving medical practitioner to be on remote standby during diving operations. Periodical safety meetings may be required, and an emergency response plan, listing emergency procedures may be required for any diving operation. Other occupational health and safety regulations may apply to diving work where any member of a dive team is exposed to relevant types of health hazard, and