The photograph shows an ice formation in Antarctica called the Blue Cave. The shot was taken during my one week expedition to the South Pole in December 2021. The existence of the cave is temporary within an annual cycle, as it is formed every year from a wave that hits the coast in the same spot, and nobody really knows why. Moreover, to visit the cave, a number of conditions has to be fulfilled - the entrance to the cave is only accessible at a particular temperature, and the sunlight has to hit the cave from a specific angle during the Antarctic summer.