BALTIMORE - Firefighter David Bobb of the Anne Arundel County Hazmat and Special Operations Station steadies a cable attached to a rescue dummy during a confined space rescue drill with the Coast Guard Yard Fire Department aboard the USS Oak Ridge, a 536-foot floating dry dock in Baltimore, Md., March 30, 2011. Confined space rescues require technical training in order to remove an injured person from a cramped location safely. U.S. Coast Guard photo by Petty Officer 3rd Class Robert Brazzell.