You can see a machine moving around in the background. But for finer cracks and stuff, perhaps they need to do some work by hand. I remember commentators (speed skating commentators, to be fair) saying that the Sochi ice was repaired by placing water/ice on top of cracks and refreezing. It looks like Plushy is putting ice on the cracks in the video.I remember Oskana Bauil also fixed the ice at her hometown by herself. Oh my... Plushy really loves the ice. Poor Rumanian skaters. They didn't even have the zamboni?