Engineers race to build a city made of snow and ice in a record-breaking 15 days in Harbin, northeast China. To accomplish this herculean task, they use cutting-edge tech and the latest construction methods to turn 110,000 tons of ice into an extraordinary supercity and polar wonderland. 

An expert team of engineers use hi-tech explosions and state-of-the-art drilling rigs to tear through solid granite and build an 11-mile underground tunnel, one of the longest in the world.