The third hour of the series begins with The Great Earthquake and Fire of 1906, the rise of California’s water re-distribution projects and the Bay's transformation into the world's greatest shipbuilding center by the close of World War II.

The third hour of the series begins with The Great Earthquake and Fire of 1906, which accelerated the dispersion of people and industry to the East Bay region. Advances in engineering gave rise to the first of California’s massive water re-distribution projects, paralleling the era of great bridge building. World War II saw the Bay transformed into the greatest shipbuilding center the world had ever known.