For non-manned launches and those that can be hardened to withstand extraordinary g-force, something akin to setup that resulted in the missing (900 kg) borehol

For non-manned launches and those that can be hardened to withstand extraordinary g-force, something akin to setup that resulted in the missing (900 kg) borehole cap of Operation Plumbbob may do the trick. Acceleration to 66 km/s is probably a little bit overkill, even. https://en.m.wikipedia.org/wiki/Operation_Plumbbob https://en.m.wikipedia.org/wiki/Operation_Plumbbob