A huge and labyrinthine Cold War nuclear bunker that lies abandoned in Germany

During the first Cold War (1947-1991), many countries prepared to survive the effects of weapons of mass destruction.

The West German government's colossal secret shelter for a nuclear war
The MRU, a mysterious underground city of nazi Germany with 80 km of tunnels

Underground shelters were built in various parts of Europe to protect civilians in the event of an NBC attack (nuclear, biological, chemical). In those years, and as a result of its defeat in World War II, Germany was divided into two parts: West Germany (a free and democratic country with an American, British and French military presence) and East Germany (a communist dictatorship under Soviet rule that became a huge prison for its inhabitants).

Nuclear shelters were built in both Germanys, some of them very large, such as the Bad Neuenahr-Ahrweiler bunker, a secret shelter prepared to house the West German government. This Sunday, the channel Exploring the Unbeaten Path published an interesting video touring one of the largest nuclear shelters in Europe, located in Germany. This bunker had three entrances (now sealed, so that access is only possible through a channel) and two water wells. It measures 7,000 square meters and had a capacity for 5,000 people, with resources for 30 days. The bunker appears to have been abandoned since 2003, when it was last inspected.

The video does not reveal the location of this bunker, but Croatian explorer Alen Banković recently visited there and the newspaper Večernji List noted that this bunker is "under the surface of an unnamed town with a population of about 250,000" in central Germany, so this bunker was probably built by West Germany:

You can see some screenshots from this video below. Here we see some of the long rows of folding seats in this bunker. The bunker has several kilometres of tunnels and the author of the video points out that they form a real labyrinth. Imagine what it would have been like to spend 30 days underground here, without seeing sunlight, with hardly any privacy and with the tunnels packed with people.

Below, one of the bunker's bedrooms. The bags contain white tarpaulins that could be used to make bunk beds. As seen in the video, some of these rooms have been used by homeless people and squatters in the years since the bunker was abandoned.

One of the bathrooms. Despite having been abandoned for so many years, the bunker is still in good condition.

One of the bunker's two wells, which would have supplied fresh water for the civilian population taking refuge there in the event of war.