"The Administration's Nuclear Posture Review considered nuclear earth penetrator weapons (EPWs), which would burrow tens of feet into the ground before detonating to improve their ability to destroy buried facilities. The FY2003 Department of Energy (DOE) budget request included $15 million to begin a study on a Robust Nuclear Earth Penetrator (RNEP). The request led to congressional and public debate because EPWs involve such policy issues as circumstances under which the United States would use nuclear weapons, military value of EPWs, and nonproliferation. This report provides background, pros, and cons. It will be updated as needed."
CRS Report for Congress, RS20834