5/5. 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. [S]
4/5. Steve finds out how washing our clothes is harming our marine life. Why has the fish and chips supper changed? And which lobster is making a comeback? [S]
2/5. 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. [S]
1/5. 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. [S]