The deepest hole humankind ever dug only got one thousandth of the way through the earth. But what would happen if you kept digging?
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The deepest hole humankind ever dug only got one thousandth of the way through the earth. But what would happen if you kept digging?
CBBC is the BBC's multiplatform offering for 6-12 year olds bringing the very best drama, entertainment and factual programmes to its young viewers.
