This diorama, built over 30 years ago for the Transport 86 trade fair, is on display at Deutsches Museum Verkehrszentrum in Munich, Germany. The museum contains three large halls of historical and present day transportation exhibits, focusing mainly on cars, trains and other ground vehicles.
The diorama depicts the construction of the U4 and U5 Munich subway lines in 1979. Rendered in 1:50 scale, it portrays both the surface and below-ground levels of the construction site. The depiction of multiple levels not only increases the exhibit’s educational value, but sets it apart from the vast majority of dioramas, which show just a single level.
The caption explains that an innovative construction technique was employed in the building of the metro lines. A compression chamber was created underground to prevent groundwater from entering the work site. Compared with the conventional approach of lowering the water table to keep the work site dry, the compression method simplified construction and ultimately reduced the total cost of the project.