New York went through the motions of a nuclear bomb attack, May 3. Lunchtime started, as it does five days a week, with lunchtime strollers, impromptu discussion groups on street corners, and sun-worshippers basking in the Spring sunshine. Wall Street, heart of the nation's financial capital, was normal. The US Treasury steps were crowded with squatters and traffic wove its way through narrow streets separating the world's highest buildings. Inconspicuously scattered along Wall Street, Broad Street and Nassau Street were civilians wearing Civil Defence armlets, and at street junctions police stood ready...and at 2:15 p.m. the busy downtown financial district was jerked from its sunny complacency by siren screeches. Policemen and CD members rushed into the streets ushering reluctant strollers into shelters, nearby buildings and Subway corridors. A few seconds after 2:15 p.m. the busiest junction in one of the world's busiest areas was deserted...activity had stopped. A few flags waved lazily at their mastheads. Policemen and CD members patrolled the empty dusty streets. Fifteen minutes later the all-clear sounded, and New Yorkers poured out from their shelters, rapidly filling the streets. Traffic started again. And within seconds Wall Street was as congested as ever. Before the clock on Trinity Church pointed to five minutes after half-past two normality had returned the simulated raid was over.