From St Abbs in Scotland, Steve reveals how ocean plastic rubbish is turned into kayaks that clean up our seas, Gillian goes oyster fishing in Cornwall and Chris meets author Philip Hoare who thinks we should all take a daily dip in the sea.

Steve uncovers the historic secrets of seabirds in Yorkshire, Gillian finds out how we're stressing our sea creatures, and Chris meets a retired couple adding to shark science.

In Herne Bay in Kent, Steve makes a jaw-dropping discovery of sharks teeth on the beach. Looking at how bad fatbergs are for the arteries of our seas. Plus we soar high over Mull with Sea eagles, and Chris meets a photographer who believes we have the best marine life in the world.

The final programme comes from St Abbs in Scotland and looks at whether herring are making a comeback, and there's exploration into the lesser-known British coral reefs.