Professional diving is a physically demanding job and there are requirements for the diver's physical condition and health.
Divers performing diving operations must hold a certificate proving that they have been subjected to a medical examination for divers which is valid for the diving operation concerned. At intervals of maximum one year, it must be renewed by the diver being subjected to a medical examination and being found fit for diving operations. In Denmark, medical examinations must be carried out only by special diving doctors who have been appointed by the Danish Maritime Authority.
The applicable legislation in this area is the act on diving operations and order no. 476 of 17 June 1999 on medical examinations of divers.