Feeding the world - the building of the sea roads - Ships and colonisation - Specialised shipping, refrigeration and oil-carrying - The great Canals - Harbour building - The men who ride ships
Written by James Miller
With music composed by Benjamin Britten

Lines on the Map is a series of feature programmes about the lines you will see on any map, the life-lines of modern civilisation. Communication by Sea, the second in the series, will be followed by dramatised programmes on communication by air and by telegraphy.