I love taking on a convoy when theres heavy fog, nothing better than on the surface running at standard speed freaking out that any moment now a destroyer could come hauling his ass out of that fog and there did be no way to escape especially in a IXC for they dive slow. Yet that the whole reason i do it, every 5 min i dive to get a sonar update then surface if my trusty boris the sonar man tells me contact is long range. The tension is high!
I like to think this is how the real uboats crew would of felt when on the surface hunting for targets in heavy fog. Dont be a pussy and dive stay on the surface and feel the terror!