Nature reserve
Giving back part of agricultural land to nature as it may open up due to vertical farming becoming economical for all crops due to extremely cheap Housing in the gem-gum era.
Better minimally invasive observability
Underground transport across the countryside making even high alpine regions easily accessible.
For nature observations and for leisure/tourism.
Above ground bridge structures for minimal invasive observations.
High protection zones may have enclosed walkways reducing spill from potentially littering tourists.
Minimally invasive surface mining that is not touching the surface at all. Though ideally we won't even need to mine below there.
No usage of explosives at all. No cracking of the bedrock.
Full structural strength preserving back-filling with material near identical to the original in mechanical properties.
Most often, calcite, quartz, basalt, dolomite.
Related: Underground working
