Immersed tube: Difference between revisions

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An Immersed tube is a kind of underwater tunnel constructed using segments built elsewhere, floated and sunk into place, then welded together to form the tunnel. This method can be considerably cheaper than excavating through rock, and is more resistant to earthquake damage. The tradeoff is that immersed tubes are more vulnerable to terrorist bombings than excavated tunnels, since much explosive force is necessary to breach their walls than would be required to penetrate the roof of a tunnel through rock.

Examples

Sydney Harbour Tunnel - road
Sydney Harbour Rail Tunnel - rail - announced 2005
San Francisco Bay - rail - BART
Hong Kong Harbour

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-An '''Immersed tube''' is a kind of underwater tunnel constructed using segments built elsewhere, floated and sunk into place, then welded together to form the tunnel.
+An '''Immersed tube''' is a kind of underwater tunnel constructed using segments built elsewhere, floated and sunk into place, then welded together to form the tunnel.  This method can be considerably cheaper than excavating through rock, and is more resistant to [[earthquake]] damage.  The tradeoff is that immersed tubes are more vulnerable to [[terrorism|terrorist]] bombings than excavated tunnels, since much explosive force is necessary to breach their walls than would be required to penetrate the roof of a tunnel through rock.
 ==Examples==
 * [[Sydney Harbour Tunnel]] - road
 * [[Sydney Harbour Rail Tunnel]] - rail - announced [[2005]]
-* [[San Fransisco Bay]] - rail - [[BART]]
+* [[San Francisco Bay]] - rail - [[BART]]
 * Hong Kong Harbour