Mile Rock Tunnel, Utility tunnel in United States of America
Mile Rock Tunnel is an underwater tunnel intended for utility services.
The Mile Rock Tunnel was constructed to replace cable car technology with electricity.
It symbolizes the progressive engineering efforts during the early 20th century.
The tunnel still serves as a critical component of San Francisco's power infrastructure.
Built within bedrock, it runs under the Golden Gate strait's turbulent waters.
Source: Wikimedia
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