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Free diving is a sport where people dive underwater as deep as they can without carrying air tanks, so just by holding their breath. We hear about Herbert Nitsch who holds the world record for the deepest free dive and find out how an why he does it - plus we'll teach some useful vocabulary along the way. This week's question: On dry land, at sea level, the pressure or weight of all the air above us is known as an atmosphere. How far underwater do you have to go until the weight of water is equal in press
