I luckily found this nest in our shed.
When I looked for something a huge hornet started flying around but flew back to a unused bird feeding house.
Since I keep all the pesticides also in there it was easy to pick up a spraycan that exterminates wasps etc.
Though the hornet of approximately 4 cm was sprayed, it flew of.
Then I sprayed the bird feeding house more over and waited if anything would move.
After taking it out and spraying inside on top and through the whole on the bottom another hornet crawled out. It died almost immediately after spraying it.
Then with some caution I broke the feeder apart and found this nest