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The antipodes of any place on the Earth is the point on the Earth's surface which is diametrically opposite to it. Two points that are antipodal to each other are connected by a straight line running through the centre of the Earth. An antipodal point it is often called an antipode (Wikipedia).
The Most of Europeans and Americans believe that if you dig a hole, in a straight line through the center of the Earth, you would come out on the other side right in China. But this is just a saying, because, in reality, if you dig a straight tunnel, in most areas, of Europe or United States you will come out in the ocean. The only places where a straight hole will emerge in China ar parts in Argentina and Chile.
Mathematically, the geographical coordinates of an antipodal point can be calculate as:
the latitude of the place you want to find the antipodes must be converted to the opposite hemisphere (eg: 45° North will be 45° South or -45°);
the longitude of the place you want to find the antipodes must be subtracted from 180° and the result will be converted to opposite hemisphere (eg: 25° West will be 180° - 25° = 155° East or -155°).