The Deep Joy pool is just outside the small Italian commune of Montegrotto Terme, about 28 miles west of Venice. It holds the Guinness World Record for the deepest pool ever filled with thermal water with depths of more than 131ft (40m) at its deepest point. As well as dives of various depths, visitors can learn to swim like a mermaid or have your photo taken under water.
ALK3R 
That’s insane! Cool though.
Wow!! This has to go on a bucket-list!