Bjoern Hoffman, left, Bauer Foundation Corporation project manager describes the Hydraulic Grab to Maj. Gen. Michael Walsh, right, deputy commanding general, Civil and Emergency Operations, U.S. Army Corps of Engineers during his July 31, 2013 visit to Nashville District’s Center Hill Dam. The Hydraulic Grab is used to pre-excavate embankment clay for the encasement wall in the ongoing Center Hill Dam Seepage Rehabilitation project. USACE photo by Fred Tucker)