Here's another NASA video showing the changes in ice extent in the Antarctic. It starts from May 26 2009 to July 31st 2010. It starts with an over view of Antarctica then zooms to the Antarctic Peninsula, going over the entire continent before zooming out again.
Again, we can see the changing thickness of the sea ice other than the boundaries consistently changing. Note that the Antarctic has 10 times more locked up water in volume than the Arctic Ocean. Think about what it'll be if the entire continent melts (which isn't impossible).
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