Kelp forests have been estimated to store and sequester approximately 30% of all blue carbon in Australia, yet are largely overlooked in the research and development of nature based solutions to mitigate climate change. Understanding the production, transformation, and fate of kelp detritus is key to producing an accurate assessment of total carbon sequestration associated with kelp forests. Here we investigate the transformation of kelp derived particulate organic carbon (POC) in a novel in situ decomposition experiment of Ecklonia radiata on the Rottnest Continental Shelf (RCS), Western Australia. Given that the approximate transport time of POC from source reefs to the Perth Canyon is estimated to take between 11-16 days, our findings suggest that approximately half the POC produced by kelp forests in this region has the potential to reach deep ocean sinks and be sequestered.