In the last century, aproximately in 2090, a large construction base was situated here. Some of its areas had been closed for unauthorized access.That was because a brand new products were here - construction robots. It seemed incredible at that time! Manufacturers consealed their inventions from competitors so these machines were used just at important strategic construction objects. Nowadays all of this has fall into decay. Robots become obsolete.
They look old-fashioned from the modern technologies point. Only at the low-budget construction sites you may see them today.