Doesn't contain actual fish, it's a bigger POD by Dowdens Pumping & Water Treatment for underground dewatering
Portable fish tanks are used in underground mines as a part of the water management process
Mine water is collected from sumps and wet areas by air driven Wilden Pumps and delivered to the fish tank.
It has a 14,000L capacity, the tank is designed to minimize maintenance
Bottom shape allows a self-cleaning action that dramatically reduces the retention of solids