German city of Dusseldorf has another very interesting point of interest: a disco club, which was opened in a former underground toilet. The owners of the new club thought that tiled walls and floor would be very good for dance parties. People can now dance next to sinks and urinals. The club owners took some care about the adequate illumination: flashes of light can be seen on the ground, which is a good thing to attract more lcients.
The choice of the city of Helsinki is not incidental as the capital of Finland had hosted US-Soviet negotiations on the limitation of nuclear stockpiles in 1969