Underwater Worlds that can be seen!

In Jiuzhaigou Valley, Sichuan providence, China there is a lake that is a clear and clean as can be. It is known for its many multi-level waterfalls and colorful lakes, and was declared a UNESCO World Heritage Site and holds 40% of all plant species found in China.

An underwater world Grüner See (Green Lake) several months of the year in Austria when the snow melts. You can see a clear view of the bottom because of the freshwater from the snow. It's like a fishtank! Terrestrial flora cannot grow at the bottom because of the rocks and water density.

http://www.liveleak.com/view?i=d18_1268454673

http://en.wikipedia.org/wiki/Gr%C3%BCner_See_(Styria)