Lesley Curwen has sailed thousands of miles around Europe on her yacht and knows the strange joy of being out of sight of land. Talking to fellow sea-lovers - sailors, a marine biologist, an artist and a Captain of a merchant ship - she asks why we are drawn to go to sea and put ourselves at the mercy of wind and waves. Is it a yearning to be close to nature, a test of self-reliance or can science explain why our brains are attracted to the ocean?

Photo: The sea. Copyright Shutterstock