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Comment by WalterBright

3 hours ago

> a cubic kilometer of ice into a neutrino detector. How? Scientists drilled boreholes 2.5km deep into the ice

Seems odd that boring 2.5km into ice would protrude 1.5km out the other side of a cubic km.

The upper layers of detectors are buried over a kilometer below the surface in order to shield the array from most cosmic rays.