this reason a stand-by diver should be one of the best divers on the team regarding diving skills and strength, but does not have to be expert at the work skills for the specific job. The stand-by diver is usually required to remain ready for deployment at very short notice during the entire working dive, and will usually be fully dressed ready to deploy, except for helmet or mask. When deployed, the stand-by diver will normally follow the umbilical of the diver who is in trouble, as unless it has been severed, it will reliably lead to the correct diver. The stand-by diver must maintain communications with the supervisor throughout the dive and is expected to give a running commentary of progress so that the supervisor and surface crew know as much as is reasonably practicable about what is happening underwater to be able to plan accordingly, and must take the necessary steps to resolve incidents, which may involve supply of emergency air or locating and rescuing an injured or unconscious diver. In bell diving, the bellman is the stand-by diver when the working diver is out of the bell, and may have to recover a distressed diver to the bell and give first aid if necessary and possible. There will generally be a surface stand-by diver in addition to the divers in the bell. The stand-by diver and working diver are generally interchangeable, unless specialised skills are required for the task of the specific dive, and professional divers are trained in rescue procedures appropriate to the equipment they are qualified to use. Rescue skills are not included in the minimum training standards for entry level recreational divers according to RSTC and ISO publications, and a diver cannot be obliged to perform procedures for which they are not qualified. Incident management In professional diving, the incident manager will be the supervisor, who should be trained and competent to handle procedures for the reasonably foreseeable incidents that may occur during diving operations for the range of diving operations they are licensed to control. The supervisor will advise and coordinate efforts by other participants until the affected diver or divers are handed over to a competent agency, or the casualty is assumed dead. The master of the vessel will be advised by the supervisor regarding safety of diving personnel, but remains responsible for the overall safety of the vessel and occupants. In