Mysterious hole looks like a big cave in Antarctica

Is there a secret military base or an alien base in Antarctica? A lock-shaped structure visible on a snowy rock in Antarctica. The hole was apparently made by human hands. The position of the hole is 66 33 '11:58' S, 99 50 '17.86 "E and 66 36' 12:58 'S, 99 43' 12.72" E. Is the hole made by the human hand, or just a hole created by nature violent Antarctica? Photo below is a