The article. Working a mile down is at the limits of our capabilities. In an emergency situation it’s nearly unobtanium. Like Kernighan’s Law for engineering.

Yeah, it seems nuts. Nuclear submarines have proven our ability to operate a small reactor a km underwater, but under land is much harder.

But at 1 atm.

If the pressure vessel fails they autoscram the reactor don’t they? I mean assuming they didn’t get hit with a torpedo.