For the UN or NASA or some other world organization to patrol the flat Earth oceans to keep people from crossing into the Antarctic, the distance they would have to patrol is 103,700km. If you spaced ships 10 kilometers apart, so that no one could sneak beyond the horizon, and that is 10,370 ships needed just to patrol that circle.
So answer this:
Who paid the bill for that many ships to be built?
What manufacturer produced them?
What foundries were employed to make that much steel needed to fill the order?
Why have we not seen any of these ships?
Of all the people it would take to make these ships function, why have we not heard a single peep from anyone or their families?
Answer:Because it doesn't f***ing exist.