I am flying through a tunnel with white, panelled walls and consistent artificial lighting. The traffic is moving on the right side of the road, which is standard for many countries. The tunnel looks modern, clean, and well-maintained. Without external landmarks or signs, it is difficult to pinpoint a specific location, but the style of the tunnel walls is quite distinctive. I suspect this might be in a major city with significant underground infrastructure, possibly in Europe or East Asia.

I am not very sure about the location yet.

then: forward

The tunnel walls are smooth and light-colored, and the lighting is consistent with modern infrastructure. I see a green sign in the distance, which is often used for highway or tunnel exits in many European countries. The driving side is on the right, and the road markings are standard white lines. The overall appearance of the tunnel suggests a high-traffic urban environment, likely in a well-developed nation. I suspect this is in Germany or a neighboring country with similar tunnel engineering.

I am somewhat sure this is in Germany.

then: guess