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World Biggest Bridge Vaults 8,25 Miles Between San Francisco and Oakland. This engineering marvel starts as a suspension span, tunnels through fog-shrouded Yerba Buena Island, and angles to the far shore as a cantilever. A double-deck Pan American Airway Stratocruiser, climbing, heads for Hawaii and the Orient; PAA pioneered this route in the 1930s. San Francisco's waterfront spread fingerlike below.