Faced with the prospect of sending Russian troops into subterranean combat, Vladimir Putin demurred. “There is no need to climb into these catacombs and crawl underground,” he told his defense ...

Hamas is believed to hide weapons, fighters and even command centers in miles of subterranean pathways and chambers. A Palestinian fighter of the Al-Quds brigade in a military tunnel in the northern ...

Paul J. Springer is a Senior Fellow of the Foreign Policy Research Institute. His comments represent his own opinion and do not reflect the official policy of the United States Government, the U.S.