The team dive into the sea for a marine special. Dougie is in Arran to find out how 15 years of a fishing ban has transformed a no-take zone in Lamlash Bay, and Arlene gets an insight into trout breeding she will never forget.The town of Cromarty has a population of just 700, and 100 of them are coastal rowers, and Anne takes to the sea to investigate why it's such a fast-growing pastime. Shahbaz chooses his favourite marine-themed viewers' photographs, and a mermaid takes us on a deep dive into the Atlantic. And we find out about the herring drifter that liberated whisky from the SS Politician and that is now being restored to its former glory.