A silicon strand is lowered from the ceiling, 一根坚韧的丝从天顶上垂下
Today caves remain the least explored places on Earth. 今天 洞穴仍是地球上 人类最少涉足的地方
However, human beings are seldom the first to reach these black, damp places. 但是 人类绝非 这个阴暗潮湿地界的第一位到访者
Here, live some of the strangest and least-known animals on the planet. 这里住着一些地球上最奇异 和最鲜为人知的动物
deep enough to engulf the Empire State Building. 足以吞没整座帝国大厦
This is the biggest cave shaft in the world. 这是世界上最大的深洞
Yet these depths were first explored only two years before man landed on the moon. 然而人类直到登月前两年 才第一次进入这个深渊
an inner world where only the most adventurous dare to go. 一个只有最勇敢者 才敢涉足的地底世界