英语听力：探索发现 2014-07-02 BBC 地平线：陨石的真相-22

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There’s actually much more to this amazing cavern³ than first meets the eye. But to understand the scale of what happened here, you have to go deeper still. Underwater.

 

I’m not sure if I’m ready for this. I’ve got all the equipment, but there’s something about going down into water when you’re not quite sure where your exit is. But I trust Bernadette completely here. She knows what she’s doing. So I’m as ready as I’ll ever be. 

 

Ready?

 

All right. 

 

Descending⁴ into the depths of the cenote is like entering a new world. Fewer people have visited some of these drowned caverns⁵ than the surface of the moon. 

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