Reference pack by The Team, Fotoref.com.

UPDATE: 44 underwater photos have been added. They were done on an additional trip using GoPro 5 camera. This spring is a natural treasure formed through the special and delicate merger of geology, ecology, freshwater biology, and geography over many hundreds of thousands of years, The reason for the blue colour and high clarity of the river is the high optical purity of the water. Pure water is intrinsically blue in hue because it absorbs red light leaving only blue and some green light to be transmitted to the observer's eye. Pure natural waters are blue to blue-green in colour because they lack light-absorbing constituents and particles. Pack includes pastoral views of the surroundings and a lot of close-ups of the plants and trees. Content: Blue Spring (420) Underwater (44)