And they are starting to come out.

A giant crack in the ice has freed an iceberg the size of a small U.S. state, and it will ignite the climate change/global warming debate; but this change will also offer unique perspective on the geological history that has never before been known. Ice is accumulating rapidly in one part of the continent, but melting in the other. According to Live Science:

Mysterious 'Crater' in Antarctica Has Ominous Cause:

A "crater" in Antarctica once thought to be the work of a meteorite impact is actually the result of ice melt, new research finds.

The hole, which is in the Roi Baudouin ice shelf in East Antarctica, is a collapsed lake — a cavity formed when a lake of meltwater drained — with a "moulin," a nearly vertical drainage passage through the ice, beneath it, researchers found on a field trip to the area in January 2016.