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3

Short version: I don't know. But I can say that space-based lasers have a history of flight anomalies. ICESat-1 being a prime example. In that case, the failure review board concluded (link below): ...that the most likely cause of failure of GLAS Laser 1 was an unexpected failure mechanism in a pump diode array that resulted in excessive power degradation ...


3

Yes, if the cavern and the mineshaft above it could be filled with perfluorobutane, the cavern could be habitable because that inert greenhouse gas is 5.4 times as dense as CO2 ! To add some sense of reality I've situated the shaft in Nier crater (43.1⁰ N, 106.0⁰ E) because, according to the NASA's Treasure Map for Water Ice on Mars, it has subsurface ice ...


16

Looks like it's not possible: To get Earth-normal pressure we need 55km https://astronomy.stackexchange.com/questions/14871/at-what-depth-on-mars-would-the-atmosphere-have-equal-pressure-of-that-on-earth But the deepest we can go looks like 7km What's the deepest a trench could theoretically be dug on Mars? And even if lava isn't a problem the rocks ...


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