In the UK, any person diving at work is required to hold a relevant qualification approved by the Health and Safety Executive (HSE). Diving schools in the UK work towards a standard HSE approved qualification, whilst divers who have trained in other countries may find their existing qualifications meet the HSE standards, if not, additional training may be required. HSE approved qualifications are well known around the world and several diving qualifications from around the world are aligned with HSE standards, allowing any diver certified to a standard recognised by the HSE to work in the UK, an important location due to the North Sea oil industry. HSE commercial diver qualifications are recognized by Australia (ADAS), Canada (DCBC), France, Norway, South Africa (DoEL) and in part by the International Marine Contractors Association (IMCA).