Hints: nonethless the continent Antarctic year-round

Huge though bergs may be, they are nonetheless usually on the move. But come the winter, sea ice forms around them and locks them solid. As winter progresses, so more and more of the sea freezes, spreading out from the margins of the land like an immense skirt so that, in effect, the continent doubles in size. When the ice reaches its farthest extent, you have to travel hundreds of miles from the edge of the continent before you reach open water.
The annual formation of the sea ice is the greatest seasonal change that takes place on this planet and it completely dominates the lives of Antarctic animals. Practically all of them are directly dependent upon the sea for their food, so year-round access to it is essential for their survival.

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