Green tunnels
What is a green tunnel?
Five green tunnels are being built between London and the West Midlands. They were strategically positioned to minimise disruption to natural habitats and local communities.
Cut-and-cover tunnels are known as green tunnels because after the tunnel structure is complete, the surface is planted with local trees, shrubs, and vegetation, creating a landscape that:
- Blends naturally with the surrounding environment
- Provides habitat for local wildlife
- Maintains ecological connectivity across the transport corridor
- Reduces visual and noise impacts for nearby communities
The cut-and-cover method is used where it delivers maximum environmental and community benefits while maintaining cost-effectiveness.
Discover our green tunnels
Construction process
The construction of green tunnels follows a three-stage process designed to minimise environmental impact and create wildlife corridors.
Stage one: Excavation
The construction of our tunnels begins with excavating a deep cutting through the surface. All of the soil and material taken out of the cutting is carefully preserved and stored nearby. This is reused for the final restoration phase.
Stage two: Structural installation
Following the excavation work, a concrete foundation is poured to create a stable base. Prefabricated concrete segments are then positioned and assembled to form the tunnel’s structural framework, creating a durable passage beneath the surface.
Stage three: Environmental restoration
The excavated earth is used to backfill the area above the completed tunnel structure. Local trees, shrubs, and vegetation are planted to restore the natural landscape, so the tunnel blends seamlessly with its surroundings and re-establishes a continuous wildlife habitat.
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