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6.8 English From BBC Learning English Hello, this is 6 Minute English and I'm Neil.
And I'm Georgina.
Now Georgina, what do you know about free diving?
Free diving is a sport where people dive underwater as deep as they can without carrying air tanks.
So just by holding their breath.
That's right.
We're going to find out today about a world record free diver.
But first a question and this is a physics one.
On dry land at sea level, the pressure or weight of all the air above us is known as an atmosphere.
How far under water do you have to go until the weight of water is equal in pressure to another atmosphere?
Is it A, 1 metre, B, 10 metres or C, 100 metres?
What do you think Georgina?
Hmm, well water is much heavier than air but there is a lot of air above us.
Many kilometres.
So I don't think one metre of water is heavy enough.
Same for 10 metres.
So I think 100 metres is the equivalent of one atmosphere.
OK, we'll find out if you are swimming comfortably or completely out of your depth later.