it should be geographically correct and was inspired by a true event; a few years ago the Bundesmarine and most other navies of Europe (with the full blessing of Copenhagen) did a test exercise to lock down the North Sea against intruders.
They only laid empty plastic landmines but had brought u-boats and all sorts else along so had to warn all the fishing vessels to give wide berth or the nets get snagged so they put out a warning on the radio teletype system (which I often tune into and decode for the weather broadcasts; its perfectly legal as we pay our taxes to the EU and you can get more accurate long term forecasts than from the broadcasters).
It was at that point I realised you could use the German national anthem to remember where these places were; especially as Kattegat sounds like it should be nearer NL than DK – the Dutch thought up the name as the channel is narrow and said “only a cat can squeeze through that small space”.
I think the same year as the military exercises they had Tomorrowland in Denmark and the Dutch put a model of a giant North European teddy bear (the proper bear-like ones) on some barge (this bear was huge, an entire group of people could sit beneath it) which was part of the décor and sailed it through the Kattegat :laugh_at:
