
This is GrĂ¼ner See (Green Lake) in Austria where every spring the ice and snow on the mountaintops melt and part of the park goes underwater; this is when the scuba divers have underwater adventurers where visitors in winter would be walking on dry land. The photographer wrote, “Two weeks ago I was able to walk over this bridge … now everything is under about 6°C (42.8°F) cold water.” Photo #1 by Wolf-Ulf Wulfrolf