In Japan, engineers are attempting to contain radioactive contamination from the Fukushima power plant by freezing the ground around it into “ice walls” that will remain frozen for years . At Nova, Jessica Morrison writes about this weird technique, which has been around for over half a century and is more commonly used as part of massive construction projects with large underground components, including Boston’s Big Dig.        

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How engineers freeze soil to create structurally sound solid walls of earth