Then why can you not drill a hole directly from the north pole and the south pole?[/url]
Yes, you could. The South Pole is technically beneath the North Pole in the Flat Earth model. The magnetic field lines rise and spread out at the North pole and don't intersect with the earth until beyond the Ice Wall (and some parts in the ocean).
The needle of a compass always aligns with the magnetic field lines in its area.
And what about the sun? Would there be two suns to make the northern "hemisphere" the same heat as the southern "hemisphere"?
The earth is laid out similar to the United Nations logo. The sun is circling clockwise over the earth. The sun's path also changes radius throughout the year to create the seasons. At Summer Solstice the Sun is traveling near the Tropic of Cancer to give the Northern Hemiplane its long days and hot summers and the Southern Hemiplane it's short days and cold winters. At Winter Solstice the sun is traveling near the Tropic of Capricorn to give the Nothern Hemiplane its short days and cold winters and the Southern Hemiplane its long days and hot summers.
And if it were like that, what about gravity? As you guys claimed that the earth is accelerating upwards by 9.8 m/s/s, so the water on the southern "hemisphere" should just fall off.
The water is contained by the Ice Wall at the coast of Antarctica, like a bowl.
Then what does the other side contain?
The matter is highly debated. Some believe it to be just rocks. Others question the concept of an "other side".
And what would you see if you continue to walk south when you arrive Antartica?
This is unknown. Some believe the earth is finite and one would eventually encounter an edge. Others believe the earth is infinite and that we live on an eternal plane which bisects the universe as a fundamental part of its geometry.