Breiðamerkurjökull Ice Cave
Breiðamerkurjökull is a glacial tongue that flows down the mountains from Vatnajökull. It is responsible for the famous Jökulsárlón glacier lagoon, Diamond Beach, and crystal ice caves. The name 'Crystal Cave' comes from the transparent white and blue ice interior. Ice caves' brilliant blue colors are a result of the compression of snow into ice. The weight of the ice presses out the oxygen. The Crystal Ice Cave has such crystal-clear walls because the glacier is so old, it's had plenty of time to squeeze out all of the oxygen. Ice and water filters light naturally, so when the sun is strong in winter, the walls can look aqua and green. The ice cave is only accessible with an experienced guide as part of a tour group. ( Vatnajökull National Park, Iceland)
