Undergrad Using the "triple point of water" to produce ice -- How does that work?

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TL;DR
A video about the deepest gold mine in South Africa, showed that at 3 Km depth, it was vital to use water cooling throughout the extensive underground works.
The video stated that at the surface, water was de-aerated and ice was formed using the triple point of water principle. It even showed a little snow ski slope was made as a demonstration. Unfortunately the physics behind this was not explained. The ice was used to chill the substantial flow of water being recirculated per second into the mine.
 

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