These underground tanks were ... that could be used for everything from drinking to firefighting. But with the advent of ...

In essence, they are building a giant underground thermos ... pools and 11 times bigger than the largest above-ground hot water tank that Mälarenergi has nearby, adds Mrs Granström.

The Basilica Cistern is Istanbul's largest surviving Byzantine cistern and one of its most unique historic sites. Constructed in 532 for Justinian I, this sprawling underground water reservoir ...

The water makes its way through rainwater systems and fine mesh filters, into a tank, usually underground, and then is pumped from that tank to be used in a number of non-potable applications. This ...