For centuries we have dreamt of reaching the centre of the Earth. Now scientists are uncovering a bizarre and alien world that lies 4,000 miles beneath our feet, unlike anything we know on the surface. It is a planet buried within the planet we know, where storms rage within a sea of white-hot metal and a giant forest of crystals make up a metal core the size of the Moon. Horizon follows scientists who are conducting experiments to recreate this core within their own laboratories, with surprising results. 译文(3): 几个世纪以来，我们一直梦想着到达地球的中心。现在，科学家们正在发现一个奇怪的外星世界，它位于我们脚下4000英里处，与我们在地表上所知道的任何东西都不同。这是一颗埋在我们所知的行星中的行星，风暴在炽热的金属海洋中肆虐，巨大的晶体森林组成了月球大小的金属核心。
