Helsinki Blasted Out an Underground Lake To Water-Cool Its Buildings
https://www-newz.blogspot.com/2014/09/helsinki-blasted-out-underground-lake.html
If you've visited Helsinki, you've probably spent time in its leafy Esplanade Park at the center of the city. Now Helsinki has turned the ground below the park into a subterranean lake which can keep buildings and other civic operations cool as part of a growing network that replaces traditional air conditioning systems.
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