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The use and maintenance of underground spaces in bedrock, e.g. those formed upon the completion of mining operations, often gives rise to discussion of other uses of remaining tunneling systems. Filling tunnels with rock blocks, concrete and groundwater is not always an optimum decision because this environmentally controlled work requires funding. Another option is to establish underground laboratories (UL?s) at these locations and to use underground spaces for non-quarrying purposes. However, the transition of s...