To be caught outside, en route to a civil defense shelter, even forty miles away from ground zero, would be life threatening. The bomb blast and shock waves would rupture lungs, shred eardrums, and cause organs to rupture and bleed. Debris—uprooted trees, sheets of metal, broken glass, electrical wires, wood, rocks, pipes, poles—everything would be ripped apart and hurled through the air at speeds of up to 150 miles per hour.