A tunnel exit is seen dug inside a U.S.-run detention facility in Umm Qasr in southern Iraq in this photo released by the U.S. military on March 26, 2005. U.S. military police have discovered two long tunnels dug with scraps of metal and wood leading out of the largest detention facility in Iraq, military officials said on Saturday. The tunnels - one 600 feet long (about 200 metres) and the other 300 feet long - led out of cell blocks at Camp Bucca, a U.S.-run facility near the southern Iraq town of Umm Qasr, where more than 6,000 detainees are held. BEST QUALITY AVAILABLE REUTERS/U.S. Army/HO HH/JJ