There is a Hochbunker close to my apartment in which about 300 people died by a single bomb hit. But not because the bomb penetrated, it detonated next to the bunker while both inner as well as outer gates were still open...
While on my way to do the weekend purchases, I took a few more pics. This is the
Hochbunker I'm talking about in my quote

The place I took this picture from is on a former steelworks area. This shelter was mainly for use by the civilians living close to the factories. At the moment I don't know it'S planned capacity, but like all shelters it was severely overcrowded during the raids, with up to 3,000 people hoping for safety from the bombs (more than 500,000 fell on Bochum during the war)

In the front is the main entrance, with gates on both sides. To my knowledge, the aerial mine which had such devastating effects detonated to the right side, between the shelter and the steel works while the inner and outer gates were still open.


This is on the right side, and here you can still see the damage on the wall caused by the bombing.

And this is the rear side. The shelter was never totally finished, the faced brickwork (
term?) is missing.
IIRC, in this city there had been build 10 large "Hochbunker" and only 1 "Tiefbunker", though there had been additional subterran Luftschutzstollen (air raid galleries)
I have to correct myself, for I did not recall correctly. In addition to literally thousands of private & corporate shelters of very different types & sizes, there were 15 public
Hochbunker and 5
Tiefbunker (underground shelters)