The deepest pool in the world recently opened, not far from the Polish capital of Warsaw. It’s called, appropriately enough, Deepspot, and it goes 45.5 meters down at its deepest point. The surrounding pool is open to swimmers at every skill level. But if you want to go deep, there’s a concrete tube for that. It even has simulated caves and ruins, for training. The Polish pool won’t be deepest for long, however; there’s a pool under construction in England that will be 50 meters deep.