Excavation of the Subsurface by Hypervelocity Impacts: Insight from Experiments and Lessons from Missions Posted on June 26, 2014 by UHNAI Webmaster in Hermalyn, B., Schultz, P. H. (). Excavation of the Subsurface by Hypervelocity Impacts: Insight from Experiments and Lessons from Missions. , 403-412,