Māori appear to be over-represented in New Zealand scuba diving-related fatalities, according to a study of data from 2007 to 2016. Data were obtained from the National Coronial Information System, the New Zealand Chief Coroner’s office, Water Safety New Zealand Drownbase™ and the New Zealand Police National Dive Squad records. A total of 48 fatalities were identified, including 40 men and 8 women, of whom 20 were Māori. Average age was 47 years, and 35 individuals were classified as overweight or obese. Identified medical risk factors included ischaemic heart disease (20 individuals), left ventricular hypertrophy (18) and hypertension (7). Multiple environmental and diving practice breaches, and poor planning, were identified in a chain of events analysis. Thirty-eight individuals had not released their weight belt, and information on resuscitation was limited.