Nemo 33 in Brussels, Belgium Besides having a standard-looking open swimming area, it also has several super deep underwater caves and tunnels that you can dive through. The awesome part is that the whole pool is filled only with spring water and it gets as deep as 113 ft. (34.5 meters).
someday, i will see this. and i will be on a pretty boat with a bubbly drink in my hand. or i'll be on the back of a lobster boat, on the rare occasion humpbacks are in the bay and i'll have a bud light in my hand. either works for me.