How do you keep track of what's happening in the oceans? Since 2008 the Reef Life Survey has completed more than 13,000 underwater surveys on every continent, led by hundreds of volunteer divers. It's an unparalleled insight into how our oceans are changing, and they've uncovered some startling and worrying trends. In this episode, James catches up with volunteer diver John Turnbull to find out what's changed in Port Phillip Bay over the past decade. You can find out more about the Reef Life Survey, and explore the data, at https://reeflifesurvey.com/

Image: A crab under a jetty in Port Phillip Bay. Source: John Turnbull/Flickr CC-BY-NC-SA 2.0.