TUNNEL SPARKS Sparks fly as welders from the 46th Engineer Combat Battalion, 225th Engineer Brigade, ensure access to underground tunnels are shut off to terrorists in Baghdad, Iraq, April 19, 2009. The engineers were called out to fix the holes left by a previous bombing. SHARE: Download: Full Size (0.07 MB) Credit: VIRIN: 038968-N-RND48-919.jpg Photo Gallery