From 2012: https://blogs.scientificamerican.com/observations/message-en...

   We report on the performance of a low-rate communications link established using the NuMI beam line and the MINERvA detector at Fermilab. 
   The link achieved a decoded data rate of 0.1 bits/sec with a bit error rate of 1% over a distance of 1.035 km, including 240 m of earth.