Slovakian hiker Tomas Nunuk, belonging to Bratislava, while hiking up Slovakia's High Tatras mountain range along with his friends, came about a see through frozen lake, Velke Hincovo Pleso.
They couldn't believe at how clear this lake was.
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Velke Hincovo Pleso is located 6,300 ft above sea level in Mengusovska dolina, under the Koprovsky stit mountain. The lake is 176ft at its deepest point, making it the biggest and the deepest in Slovakia.
The formation of such strikingly clear ice has to do with the rate of freezing: "If the water is cooled too quickly it doesn't have enough time to reject any impurities as it crystallizes-those impurities are then held within the crystal lattice and distort the crystal lattice. Thus, if there are impurities such as trapped gases, organic material and other minerals or dissolved salts (an inhomogeneous mixture) the ice will appear optically translucent, or even opaque. However, if the water cools and freezes over a longer duration of time, it has time to reject these impurities as it crystallizes. This eventually gives rise to a more homogenous mixture and less defects in the crystal lattice which creates clear, transparent water ice."