You're facing where sections of the U-Boats would be brought in by rail. The circle in the center is where one of the turntables was located. Panning to the left you can see how long the building was. This was one of two sections. In the ceiling you can see two holes where bombs came through and some of the steel reinforcing rod hanging down. Panning further to the left, and directly behind where you started, is another turntable and another section of the bunker. Then all the way around to where you started.