Listening to these friends talking about their hobby, you wouldn’t necessarily conclude that it sounds like a good time. You’re in the dark, cold, wet and it’s “a bit complicated”, Dirk Terbeek tells us. Wilfried de Jonge describes their leisure pursuit as quite strenuous, going on to talk about how extremely dependent the divers are on winds and currents, and of the potential dangers involved. Oh and also, you can hardly see a thing. Dirk Heinemann points out that you’d have to like that about it. Question him further and he’ll also tell you about the bones and skulls they come across every now and then. Their wives would prefer them to put this pastime behind them, but that’s never going to happen.