Hello, some long time ago I've heard the suggestion that low-yield radiation-free nuclear devices may some day be used for peacefull purposes, such as large scale removal of ground, e.g. for mining operations. Does current physical knowledge allow for the possibility to develop such devices in the future (not that I think they should be developed, but out of pure curiosity)? How might a device like this operate? What are the unknowns that would need to be researched in order to develop such technology?