Video – Bridge building but backwards…

San Francisco’s famous Bay Bridge is slowly retracting.

What was once the largest cantilever bridge in the US is slowly coming down.

The old San Francisco Bay Bridge – which sits alongside its shiny new replacement – is being dismantled using what engineers are describing “bridge building but backwards” techniques.

Project engineers have used old photos and construction records to analyse how the bridge was built. The bridge is now being dismantled in reverse.

The demolition is expected to last for three years.