Antarctica does not exist

Antarctica is a tricky problem for flat earthers.  It's very existence disproves flat Earth so they have no option but to simply deny its existence and ignore all evidence to the contrary.  

In order to ignore all the evidence they are then forced to concoct all manner of conspiracy theories, including imaginary armies of soldiers stopping people from attempting to go there, non existent international agreements, made up no fly zones and an endless stream of fake videos and accounts from tourists and adventurers.

It would be straight forward to prove its existence or non existence simply by attempting to charter a plane for an overflight but no flat earther has ever tried.  Flat earthers never seem that keen on actually putting their ideas to the test, presumably because it is easier to believe nonsense if you never look into it too closely.

42. The distances travelled in Antarctic expeditions are incompatible with a spherical Earth

“In the ball-Earth model Antarctica is an ice continent which covers the bottom of the ball from 78 degrees South latitude to 90 and is therefore not more than 12,000 miles in circumference. Many early explorers including Captian Cook and James Clark Ross, however, in attempting Antarctic circumnavigation took 3 to 4 years and clocked 50-60,000 miles around. The British ship Challenger also made an indirect but complete circumnavigation of Antarctica traversing 69,000 miles. This is entirely inconsistent with the ball model.”

43. Dubay makes up some lies about aircraft not flying over Antarctica

“If Earth was a ball there are several flights in the Southern hemisphere which would have their quickest, straightest path over the Antarctic continent such as Santiago, Chile to Sydney, Australia. Instead of taking the shortest, quickest route in a straight line over Antarctica, all such flights detour all manner of directions away from Antarctica instead claiming the temperatures too cold for airplane travel! Considering the fact that there are plenty of flights to/from/over Antarctica, and NASA claims to have technology keeping them in conditions far colder (and far hotter) than any experienced on Earth, such an excuse is clearly just an excuse, and these flights aren’t made because they are impossible.”

57. All videos of the midnight sun in Antarctica are fakes

“The establishment claims the Midnight Sun IS experienced in Antarctica but they conveniently do not have any uncut videos showing this, nor do they allow independent explorers to travel to Antarctica during the winter solstice to verify or refute these claims. Conversely, there are dozens of uncut videos publicly available showing the Arctic Midnight Sun and it has been verified beyond any shadow of a doubt.”

106. No-one has been able to verify the location of the South Pole

"The so-called “South Pole” is simply an arbitrary point along the Antarctic ice marked with a red and white barbershop pole topped with a metal ball-Earth. This ceremonial South Pole is admittedly and provably NOT the actual South Pole, however, because the actual South Pole could be demonstrably confirmed with the aid of a compass showing North to be 360 degrees around the observer. Since this feat has never been achieved, the model remains pure theory, along with the establishment’s excuse that the geomagnetic poles supposedly constantly move around making verification of their claims impossible."

109. The Earth is flat and there is no South Pole

"There are no fixed “East” or “West” points just as there is no fixed “South.” The North central Pole is the only proven fixed point on our flat Earth, with South being all straight lines outwards from the pole, East and West being concentric circles at constant right angles 90 degrees from the pole. A westerly circumnavigation of Earth is thus going around with Polaris continually on your right, while an easterly circumnavigation is going around with Polaris always at your left."

111. Antarctica is a no-fly zone so no-one discovers that the South Pole does not exist

"Since the North Pole and Antarctica are covered in ice and guarded “no-fly” zones, no ships or planes have ever been known to circumnavigate the Earth in North/South directions. The only kind of circumnavigation which could not happen on a flat-Earth is North/Southbound, which is likely the very reason for the heavily-enforced flight restrictions. The fact that there has yet to be a single verified North/South circumnavigation of Earth serves as standing proof the world is not a ball."