A number of trips to Hat Head (northern NSW, Australia) were conducted in 2013 to gather data investigating the influence of submarine groundwater discharge on carbon cycling in coastal waters. It was thought that dissolved carbon dioxide may be highly enriched in groundwater. We set out to scientifically show how groundwater discharge was a source of carbon dioxide to rivers, estuaries and coastal waters using radon (a natural groundwater tracer). Later in 2015 a well-received paper was published by members of our group. This study provides insights into the impacts of submarine groundwater discharge on the carbon budget in coastal waters