Scientists have discovered there is more to Antarctica than meets the eye. A new map of the landscape beneath the frozen continent’s ice sheet has revealed a previously hidden world of mountains, deep canyons and rugged hills in unprecedented detail.

The Antarctic ice sheet is a vast expanse of ice covering approximately 98% of the continent. While the frozen surface has been fairly well-studied, the ground beneath this two-kilometer-thick layer has remained a mystery. In fact, until now, we knew more about the surface of Mars than what lies beneath the bottom of our own planet.

The ice sheet plays a crucial role in our climate. Not only is it a major freshwater reservoir, but its icy surface reflects sunlight, helping cool Earth. But because our computer models are missing key details about the land it sits on, it is difficult to predict factors such as exactly how fast the ice will melt and how much sea levels will rise.