They are trying to hide something in Antarctica?

An out of place anomaly has been discovered in the middle of nowhere of Antarctica. The size of the anomaly is 105Lx40Wx10H meters.

Is it something that has formed naturally over the years, could it be artificial to hide something or could it be a stitching error? 


In addition, images of Saunders Island near Antarctica also show an out of place anomaly that raises questions. 

Coordinates: 
Antarctica: 66°37'37.57"S 110°16'39.19"E (time line 2004)
Saunders Island: 57°48'32.09"S 26°28'25.87"W