Today Steve Brown reveals how plastic rubbish found on beaches is being turned into kayaks that clean up our seas. Gillian Burke goes oyster fishing in Cornwall and Chris Packham meets author Philip Hoare who thinks we should all take a daily dip in the sea.

Gillian Burke finds out how our marine industries are stressing sea creatures, Steve Brown uncovers the historic secrets of seabirds in Yorkshire and Chris Packham meets a retired couple who are contributing to shark science.