The journey to the centre of the earth is a voyage like no other we can imagine. Over 3,000 km below the earth's surface an extraordinary inner world the size of Mars awaits us. Dive through the molten iron of the outer core and eventually you will reach a solid sphere - an iron-clad world held within a metal sea and unattached to anything above. At the earth's core is the history of our planet written in temperature and pressure, crystals and minerals . . . Our planet appears tranquil from outer space. And yet the arcs of volcanoes, the earthquake zones and the auroral glow rippling above our heads are testimony to something remarkable happening inside . . . For thousands of years these phenomena were explained in legend and myth. Only in recent times has the brave new science of seismology emerged. One hundred and fifty years after the extraordinary, imaginative feat of Jules Verne's JOURNEY TO THE CENTRE OF THE EARTH, David Whitehouse embarks on a voyage of scientific discovery into the heart of our world.