[00:00:24]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

[00:03:40]and they want to have a closer look.

他们想要来个近距离观察

[00:06:17]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

[00:16:10]As you can see, it's dry up here,

可以看到这里已经干涸

[00:17:31]but if you listen,

但如果仔细听

[00:18:37]you can hear the thunder of,

便能听到大量的流水

[00:20:04]there's a lot of water entering it at some depth.

从深处贯入其中的隆隆声

[00:24:54]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

[00:28:25]to discover how much water is flowing through the ice.

来研究有多少水在冰川里穿梭

[00:37:36]As they drop, they travel back in time.

向下深入的时候 他们仿佛回到了从前

[00:42:52]30 metres down and they reach ice formed from snow that fell

三十米深处的冰是一万年前

[00:47:05]10,000 years ago, in the last Ice Age.

冰河世纪时期的降雪堆积起来的

[00:52:36]When this lake drained and the plug got pulled

一旦湖水干涸 就像打开了阀门

[00:56:12]and the whole lot flushed down through here,

整个水流都会从这冲刷而下

[01:00:25]this ice sheet, it rose by a metre

这块冰原就会增高一米

[01:03:26]as that water accessed the bed and forced,

因为水流到了冰床之下

[01:06:11]jacked up the ice sheet.

迫使冰原提升

[01:07:59]So, we know that the water

我们知道

[01:09:28]in this whole plumbing cavity system, down here,

水在这整个垂直坠落过程中

[01:13:45]we know that shoots straight through that ice

径直冲破了冰川

[01:16:40]and actually hits the bed of the ice sheet.

直接撞击了冰原的底部

[01:19:43]We've hit the water, I can see the water now.

我们到水边了 我能看到水了

[01:22:21]Great. Nice work.

很棒 干得漂亮