In Australia, there is a magical underwater park called Green Lake. It is located in Tragoess, among the snowcapped mountain. Visitors can easily walk in this park in most time of the year, but when the weather becomes warm, the snow begins to melt and the water level in Green Lake begins to rise covering the whole park. The depth of the Green Lake’s water is about one meter in usual, but when the Green Lake is in flood, it could have a depth of more than ten metres. Flowers, trails, rocks and trees in the park are drowned in the crystal clear waters in spring, if you dive into the lake, you will see the bright sunlight through the water, which makes it so beautiful as if you come to a magic world.