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Tunneling News

Cincinnati to study repurposing of abandoned subway tunnels

The City of Cincinnati has issued a Request for Proposals (RFP) for a feasibility study to explore adaptive reuse options for its unused subway tunnel system beneath Central Parkway. The tunnel infra...

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Alpine Geology Overcome: Brenner Tunnel Milestone Reached

The Brenner Base Tunnel (BBT), stretching 64 km including the Innsbruck bypass, has achieved a significant milestone with the connection of its exploratory tunnel between Austria and Italy. This achi...

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Italy Launches Campolattaro Reservoir Project

Construction has officially commenced on the Campolattaro Dam in Benevento, Italy, following the launch of the tunnel boring machine (TBM) “Falanghina” on September 10, 2025. The project, originally...

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Innovative Triple-Circular Pipe Roofing Machine to Support Sanya Estuary Tunnel

A new triple-circular pipe roofing machine, named “Lucheng,” has been developed to advance the Sanya Estuary Passage Project in Hainan Province, China. The tunnel will provide a critical connection b...

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Fehmarn Belt Tunnel: World’s Longest Immersed Tunnel Faces Delays

The Fehmarn Belt Tunnel, designed to connect Rødbyhavn in Denmark with Fehmarn in Germany, is one of Europe’s most ambitious infrastructure projects. Spanning 18 kilometers beneath the Baltic Sea, it...

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Artificial Ground Freezing: Applications, Techniques, and Key Considerations

Artificial Ground Freezing (AGF) is a temporary ground improvement technique widely applied in tunneling, shaft sinking, and underground construction below the water table. The method involves loweri...

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£3bn Haweswater Aqueduct Upgrade to Secure Water for Generations

The £3bn Haweswater Aqueduct Resilience Programme (HARP) has officially reached financial close, setting the stage for one of the UK’s largest water infrastructure upgrades. Originally constructed be...

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Artificial Ground Freezing as a Tool in Urban Tunnelling

The construction of cross passages along High Speed 2’s (HS2) London tunnels represents the most extensive application of artificial ground freezing (AGF) in the UK. These cross passages, typically 5...

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Second Ontario Line Tunnel Shaft Marks Key Milestone in Toronto Transit Expansion

The Ontario government has officially broken ground on the second tunnel launch shaft for the Ontario Line near the future Gerrard Station. This shaft will serve as the northern starting point for tu...

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Sydney Metro West Marks Tunnelling Milestone at Parramatta Station

The Sydney Metro West project reached a major tunnelling milestone with the arrival of tunnel-boring machine (TBM) Dorothy at the Parramatta station box. After a 17-month journey through solid sandst...

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