In 1906 San Francisco was a booming metropolis, the ninth largest city in the United States, optimistic and wide open - despite labor unrest, political corruption and a plague outbreak in Chinatown no one talked about. At 5:12 a.m. on April 18, everythin g changed. This KRON program looks back at San Francisco before the 1906 Earthquake, what happened when the earth shook, why 500 city blocks went up in flames and how the city came back. Filmmaker Ken Swartz; narrator Will Lyman. Young Broadcasting of Sa n Francisco, Inc.