It dawned on me, and stop me if you have heard this before, but Damocles knows pretty much exactly where PB was. His ground motion sensors should have lit up when the nuke went off three years after the war. He should have been well versed in calculating the precise location of a nuclear ground burst from seismic data. The fact that it was a ground burst in US territory, not near any targets, nuclear or otherwise and a couple of years after the war will be odd, to say the least.
All the players need do is ask.
In fact the University of Texas folks might well have seismograph data that would also have some data.
https://arstechnica.com/science/2016...n-north-korea/