The first shot from the sub-seismic cannon hit the basin air at 7:04 AM and produced a sound that wasn't a sound.It was felt. In the shelf rock, in the bones, in the specific way that frequencies below normal hearing registered — not as noise but as pressure, the physical experience of air moving at a frequency the ear wasn't built to process.The fourth shelf's basalt face began to vibrate.Not visibly. Not dramatically. The vibration was at the molecular level, the crystalline structure of the basalt responding to a frequency tuned to its natural resonance — the specific frequency at which basalt, given sufficient amplitude and time, stopped being basalt and became rubble.Xander felt it through the shelf rock under his boots.He calculated the time it would take for the resonance to accumulate to failure-level amplitude and arrived at an answer he didn't like.He was already moving."Dunmore," he said, into the comm."Here," Dunmore said."Surface breach, now. Behind the rail chass
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