Underground delivery tunnels are tunnels designed for the delivery of goods, materials, and equipment from one location to another. These tunnels are typically used in urban areas where the transportation of goods by surface vehicles can cause traffic congestion and other issues.

Underground delivery tunnels can take several forms, including:

1. Subway systems: Some urban areas have subway systems that can be used for the delivery of goods. These systems typically have separate tunnels or tracks for freight transport.
2. Pneumatic tubes: Pneumatic tubes are a type of delivery system that uses compressed air to propel containers through a network of tubes. These tubes can be installed underground, and are commonly used for delivering documents, money, and small items.
3. Conveyor systems: Conveyor systems are a type of delivery system that use belts or other moving surfaces to transport goods from one location to another. These systems can be installed underground to avoid surface congestion and minimize the impact on the surrounding area.
4. Automated guided vehicles: Automated guided vehicles (AGVs) are self-driving vehicles that can be used to transport goods through underground tunnels. These vehicles can be programmed to follow a specific route and avoid obstacles, and are often used in large-scale manufacturing and distribution facilities.

Underground delivery tunnels can provide several benefits, including:

1. Reduced traffic congestion: By moving the transportation of goods underground, the surface roads can be freed up for other vehicles, reducing traffic congestion and improving overall traffic flow.
2. Increased safety: Underground delivery tunnels can help to reduce accidents and improve safety by separating the delivery of goods from pedestrian and vehicle traffic.
3. Greater efficiency: Delivery times can be improved by using underground tunnels, as traffic congestion and other delays can be avoided.
4. Improved environmental impact: By reducing the number of vehicles on the road, underground delivery tunnels can help to reduce air pollution and greenhouse gas emissions.

Overall, underground delivery tunnels offer a safe, efficient, and environmentally friendly method for transporting goods, materials, and equipment in urban areas.