Den Helder and the marine mystery at the Marsdiep
Discover the naval city of the Netherlands >

Only in Dutch
Experience what the “raw” city of the navy in the Kop van Noord-Holland hides. Start at Willemsoord, the former navy ship and maintenance yard, and delve into the past of the naval city of the Netherlands. Find out what the city of 'the Beachcombers' has to offer and, while searching and puzzling, unmask the spy who is after the naval secrets.