In the international Deep Underground Neutrino Experiment, hosted by Fermilab, a beam of neutrinos will be sent from Fermilab outside Chicago straight through Earth’s mantle to Sanford Lab in Lead, South Dakota. Fermilab recently finalized an agreement with construction firm Kiewit-Alberici Joint Venture to start pre-excavation work for the Long-Baseline Neutrino Facility, which will house the detectors.