Another wasps nest

I found another wasps nest on the garage floor. This one is a bit bigger (5cm across) than the last one. Lets hope they don't keep getting bigger.  

TrikinDave said that it was a queen's nest, to be enlarged once the workers hatched. I guess something is going wrong with the chosen location.

There is no sign of wasps, and I'm baffled where they are coming from. Perhaps they are old. On the base it looks as if it was attached to a wire, and I can't find anything likely in the garage.

I have had much larger ones built there in the past. They are beautiful structures, and must take a lot of effort to build. It's just a shame the occupants are quite threatening when I get in the car.