The International Physicians for the Prevention of Nuclear War (IPPNW) is an international organisation covering many countries. In Australia the Medical Association for the Prevention of War (MAPW) are affiliated with them. MAPW has been an active member group of iPAN since it’s formation.
See the joint statements here.
https://www.ippnw.org/wp-content/uploads/2021/09/IPPNW-statement-Nuclear-Subs-letterhead-21.9.21.pdf
https://www.ippnw.org/wp-content/uploads/2021/09/Summary-of-joint-statement-AUKUS-21.9.21.docx.pdf
https://www.ippnw.org/wp-content/uploads/2021/09/Nuclear-submarine-quotes-IPPNW-21.9.21.docx.pdf