纪录片《冰冻星球》 第79期 履于薄冰（11）（在线收听）

Alun's team have found the hole down which the lake disappeared

艾伦的团队已经找到了让湖水消失的洞穴

and they want to have a closer look.

他们想要来个近距离观察

It's not a job for anyone with a fear of heights.

这对恐高的人来说是绝不可能的

As you can see, it's dry up here,

可以看到这里已经干涸

but if you listen,

但如果仔细听

you can hear the thunder of,

便能听到大量的流水

there's a lot of water entering it at some depth.

从深处贯入其中的隆隆声

Alun wants to place a sensor deep into the moulin

艾伦想在冰川锅穴深处安装一个传感器

to discover how much water is flowing through the ice.

来研究有多少水在冰川里穿梭

As they drop, they travel back in time.

向下深入的时候 他们仿佛回到了从前

30 metres down and they reach ice formed from snow that fell

三十米深处的冰是一万年前

10,000 years ago, in the last Ice Age.

冰河世纪时期的降雪堆积起来的

When this lake drained and the plug got pulled

一旦湖水干涸 就像打开了阀门

and the whole lot flushed down through here,

整个水流都会从这冲刷而下

this ice sheet, it rose by a metre

这块冰原就会增高一米

as that water accessed the bed and forced,

因为水流到了冰床之下

jacked up the ice sheet.

迫使冰原提升

So, we know that the water

我们知道

in this whole plumbing cavity system, down here,

水在这整个垂直坠落过程中

we know that shoots straight through that ice

径直冲破了冰川

and actually hits the bed of the ice sheet.

直接撞击了冰原的底部

We've hit the water, I can see the water now.

我们到水边了 我能看到水了

Great. Nice work.

很棒 干得漂亮