The location of the treasure chestBassie & Adriaan: Het geheim van de schatkaartThe scenes of walking through the caves in search of the treasure chest were shot in the Municipal Cave in Valkenburg. The scenes where the treasure chest was located and where Adriaan loosens the leather belts in the water, which were recorded in the caves on Lanzarote: Cueva de los Verdes. Unfortunately, the part where the filming was done is no longer accessible to the public.