The article is actually pretty fascinating regarding how it was all done. Light can't go through rock (very far), neither can most other particles (some farther than others). Neutrinos can pass through earth and the sun unimpeded. It is neat apparently they set up a fiber optic link to test the timing between the 2 locations (modeled the correct Length). The locations were know to plus or minus 20cm. Time was synced within a few ns using symmetricom cs gpsdo's near as I can tell.
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