Comment by cozzyd

Disclaimer: I work on ANITA

The two relevant events had RF emission from 27 and 35 degrees below the horizontal. If interpreted as emission from upward-going EAS, then the particle would be within a degree or so of that. So they don't go all the way through the Earth, but through a chord long enough that, if our shower energy estimate (which, admittedly, is fraught with peril, we have an order of magnitude errors on that), no standard model particle could have made it through (yes, at high energies, the Earth is opaque to neutrinos).