ave you ever wandered just how deep can a man made pool get ? Well, you may find the answer in Millepini, a thermal resort in northern Italy. This isn’t your ordinary resort. This isn’t your ordinary resort. It is home to a very special pool called the “Y-40”. Number “40” is in it’s name for a good reason and marks the pools maximum depth of 40m, thus making it the deepest pool in the world – according to the Guinness Book of world records.