We all love the blue ocean and we love being with those amazing marine creatures, but it is not the only choice we have to enjoy the underwater tranquility. Pool diving, nonetheless, could be as fascinating as well. It is more reachable for some city dwellers and it offers a stable environment for divers all year around. Of course, we are not talking about the usual pool in your neighborhood. Here, FiDive is introducing you some of the deepest pools for diving in the world!