Cave at the foot of Svinafellsjokull Glacier
It is quite common for ice caves to come and go around the feet of glaciers, as each season some of the ice melts and new ice forms.
Blue coloration of glacier ice occurs after years or even centuries of pressure have squeezed out all the air and changed the structure of this special type of ice to form crystals that reflect mostly blue or turquoise light.
This cave is located at Svinafellsjokull Glacier, in Skaftafell, Iceland.