地球的力量 第5集 稀有行星（18）:专业洞穴潜水员
好了，我下来了 喔 看有多大
This is magnificent.That is beautiful.So, lower thegear, please.
真是太神奇了 太美了 请把装备往下放!
Theres actually much more to this amazing cavern than first meets the eye.
这个山洞其实要比第一眼看到 更让人惊叹
But to understand the scale of what happened here,
但是要理解这里究竟发生了多大规模的灾难
you have to go deeper still, underwater.
你必须要更深入，到水下
Cave diving is notoriously risky.It's all too easy to get trapped.
山洞潜水非常危险 很容易被困在里面
But Bernadette's a professional cave diver,
但是伯纳德特是个专业洞穴潜水员
so I'm in good hands.Okay.
所以我有很好的保护者 好了
Descending into the depths of the cenote is like entering a new world.
进入沼穴深处就像进入一个新的世界
Fewer people have visited some of these drowned caverns
到这个洞里潜水的人
than the surface of the Moon.
比登上月球的人还少
As divers have explored further,
潜水员进行越多的探索
they've discovered the cenotes are actually part of a huge complex of tunnels and caves.
他们就会发现沼穴其实是 一片巨大的隧道和山洞组成的
In fact, when you look from above, you can see
实际上，你从上面看
there are cenotes scattered across Mexico's Yucatan Peninsula.
会看到沼穴遍布几百公里
And when they're mapped, it becomes clear that they follow
绘图后，会发现它们在丛林之间
a distinctive circular course through the jungle.
形成了一个明显的半圆形
