(I don't know if this is the best place to ask this, if not please feel free to move it elsewhere or delete it.) A number of Quantum Gravity papers explore the evolution of Black Holes and their potential transition to White Holes, and some discuss the possibility of astronomical observation of the phenomenon. I have also seen descriptions of experiments on BH analogues with optics or acoustics. However I haven't seen descriptions of proposed experiments on actual Black Holes. My question is, how close is experimental physics to being able to study actual Black Holes in the lab - i.e. engineer micro-BHs, presumably in large accelerators, and observe them to test such theories? Are there proposals in this area? Or is there a reason this might not be feasible in principle, or in practice for the foreseeable future? Thanks!