As the temperatures rise in spring, snow melts and floods the park to create a 10 meter deep lake.

This lake in Austria lets divers swim past benches, hiking trails, signs, trees and plants that are above the water for half of the year. The Green Lake sits at the foot of the snow-capped Hochschwab mountains and during the winter is only 1 or 2 metres deep so the area is used as a county park. However, when spring comes around, the rising temperatures cause the snow on the mountains to melt and run down the slopes, making the water levels of the lake rise to as high as 10 metres. So for half of the year the spot is popular with hikers and for the other half it attracts divers who want to explore the unusual waters. Take a look at this underwater film of the area:

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