The analogy of streams, rivers and their tributaries as the veins and arteries of the earth is not inappropriate. They are indeed the "lifeblood" of the world. Each river is part of a huge eco-system.

Five people, whose lives interrelate, live the build-up to Christmas in different ways in different places. A sudden blackout changes their lives forever...

Carmen talks to a white-water rafting expert and a parkour enthusiast.