Ice caves are temporary structures that appear at the edge of glaciers. They look amazingly beautiful from the inside. This particular cave is located on the frozen lagoon of the Svínafellsjökull glacier in Skaftafell, Iceland.
The cave is accessible through a 22-foot entrance on the shoreline. At the end it tapers to a tight squeeze no more than four feet high. Ice caves are in general unstable things and can collapse at any time. They are safe to enter only in winter when the cold temperatures harden the ice. Even so one could hear constant cracking sounds inside the cave. It was not because it was going to collapse but because the cave was moving along with the glacier itself. Each time the glacier moved a millimeter loud sounds could be heard.