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gptkb:Cross-Harbour_Tunnel
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up to 30 meters below sea level
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gptkb:Thames_Tideway_Tunnel
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up to 70 meters
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gptkb:Dartford_Tunnel
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up to 30 meters below riverbed
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gptkb:Chunnel
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up to 75 meters below sea level
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gptkb:Thames_Tunnel_Company
|
75 feet
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gptkb:The_Thames_Tideway_Tunnel
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up to 70 meters
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gptkb:Moffat_Tunnel
|
varies
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gptkb:Detroit-Windsor_Tunnel_Corporation
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75 feet
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gptkb:Large_Hadron_Collider
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50 to 175 meters
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gptkb:Istanbul_Tunnel_Project
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varies by location
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gptkb:Marmaray
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60 meters below sea level
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gptkb:Mersey_Tunnels
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up to 30 meters
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