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

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.


3,6 km | ± 2 hour

Our Scavenger hunt App

No hassle with logging in and printing

Simply open the App, choose a route and go. Open the City Sherlocks app, select the desired route and choose to buy the complete route. You will then automatically be redirected to Google Pay or Apple and can pay by telephone. The person who makes the payment receives the route on the phone. The route adventure is played on that phone.