In this surprising and engrossing two part series Dr Helen Czerski will go on a spectacular journey into the world of sound to discover what it is how it’s detected and what it can tell us about the world, and even the universe. From the top of one of Europe's most active volcanoes to Big Ben, Helen will explore the limits of sound. A cochlea implant switched on for the first time illustrates the complex mechanisms unpinning the human hearing apparatus.

Helen examines how the very nature of sound has helped us survive, communicate and explore our surroundings. From imaging the vocal cords of singer Lesley Garrett to tracing the development of sonar technology Helen probes the power of sound to communicate, revealing how sound has helped us see underwater, driven the evolution of extraordinary biological systems and helped us understand our planet. Sound has the potential to help save lives and solve some of the greatest mysteries of the universe.

Packed with spectacular imagery, jaw-dropping experiments and some of the most remarkable sounds you’ve ever heard, this is the ultimate guide to one of our universe’s most magical phenomena. Helen will see and hear the cutting edge of sonic research and experience the power of sound for herself, exploring the extreme ends of the sonic spectrum to reveal your world as you’ve never heard it before.