![Carlin Tunnel](https://c1.vgtstatic.com/thumb/1/3/134312-v1/carlin-tunnel.jpg)
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![Cassiar Tunnel](https://c1.vgtstatic.com/thumb/1/3/134153-v1/cassiar-tunnel.jpg)
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![Cassiar Tunnel](https://c1.vgtstatic.com/thumb/1/3/134353-v1/cassiar-tunnel-1.jpg)
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![Cave entrance](https://c1.vgtstatic.com/thumb/5/0/50440-v1/cave-entrance.jpg)
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![Cave Rock Tunnel](https://c1.vgtstatic.com/thumb/1/3/134311-v1/cave-rock-tunnel.jpg)
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![Central Artery/Tunnel Project (a.k.a The Big Dig)](https://c1.vgtstatic.com/thumb/8/3/83833-v1/central-artery-tunnel-project-a-k-a-the-big-dig.jpg)
© Google Maps
![Central Artery/Tunnel Project (aka The Big Dig)](https://c1.vgtstatic.com/thumb/8/3/83834-v2/central-artery-tunnel-project-aka-the-big-dig.jpg)
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![Central Expressway Tunnel](https://c1.vgtstatic.com/thumb/1/3/134428-v1/central-expressway-tunnel.jpg)
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![Central Jersey Expressway Tunnel - Rt. 29 Trenton](https://c1.vgtstatic.com/thumb/1/3/134339-v1/central-jersey-expressway-tunnel-rt-29-trenton.jpg)
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![Channel Tunnel](https://c1.vgtstatic.com/thumb/1/3/134408-v1/channel-tunnel.jpg)
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![Channel tunnel french entrance](https://c1.vgtstatic.com/thumb/2/0/20564-v1/channel-tunnel-french-entrance.jpg)
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![Chesapeake and Ohio Canal Paw Paw Tunnel, North Portal](https://c2.vgtstatic.com/thumbll/1/4/14024-v1/chesapeake-and-ohio-canal-paw-paw-tunnel-north-portal.jpg)
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![Chesapeake and Ohio Canal Paw Paw Tunnel, South Portal](https://c2.vgtstatic.com/thumbll/1/4/14022-v1/chesapeake-and-ohio-canal-paw-paw-tunnel-south-portal.jpg)
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![Chesapeake Bay Bridge-Tunnel](https://c1.vgtstatic.com/thumb/7/3/735-v2/chesapeake-bay-bridge-tunnel.jpg)
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![Chesapeake Bay Bridge-Tunnel](https://c2.vgtstatic.com/thumbll/6/1/61825-v1/chesapeake-bay-bridge-tunnel-1.jpg)
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![Chesapeake Bay Bridge-Tunnel](https://c1.vgtstatic.com/thumb/1/3/134204-v3/chesapeake-bay-bridge-tunnel-2.jpg)
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![Chesapeake Bay Bridge-Tunnel North portal](https://c1.vgtstatic.com/thumb/1/3/134325-v1/chesapeake-bay-bridge-tunnel-north-portal.jpg)
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![Cheung Tsing Tunnel](https://c1.vgtstatic.com/thumb/1/3/134363-v1/cheung-tsing-tunnel.jpg)
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![Chunnel Entrance - UK Side](https://c1.vgtstatic.com/thumb/4/1/4162-v1/chunnel-entrance-uk-side.jpg)
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![Churia Tunnel](https://c1.vgtstatic.com/thumb/2/3/232643-v1/churia-tunnel.jpg)
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![Clem Jones Tunnel](https://c1.vgtstatic.com/thumb/1/3/134391-v1/clem-jones-tunnel-1.jpg)
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![Clem Jones Tunnel](https://c1.vgtstatic.com/thumb/1/3/134124-v1/clem-jones-tunnel.jpg)
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![Cleveland Tunnel](https://c1.vgtstatic.com/thumb/2/3/233877-v1/cleveland-tunnel.jpg)
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![Clyde Tunnel](https://c1.vgtstatic.com/thumb/1/3/134334-v1/clyde-tunnel.jpg)
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![Clyde Tunnel](https://c1.vgtstatic.com/thumb/1/3/134541-v1/clyde-tunnel-1.jpg)
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