Is this the supposed lake below the ice where the Russians were drilling a while back?
Lake Vostok breakthrough: Russian scientists drill clean hole into Antarctic subglacial basin
https://www.rt.com/news/226127-lake-vostok-russia-water/
Or the melting could be caused by heat from the underground Nazi base.
Or perhaps it’s just the shadow of a cloud?
They were over the ground. This is in the ice shelf..................