sentences:  All member countries of the European Union are expected in terms of directive EEC 92/51 to recognise one or both of these training levels.An applicant who satisfies the requirements will be issued with either an ESD or an AESD certificate that is valid for five years, and must be renewed every five years by application to the issuing authority.The certificate holders must comply with all national and local rules regarding medical fitness, workplace safety, insurance, and limitations on scientific diving activities when engaged in scientific diving in a host member country.