Sub lookout questions

[WildYak]

Since installing GWX, I've encountered a couple of enemy subs. Each time they were escorting a convoy and each time they were submerged. I suppose that a submerged enemy sub is no threat at all, since the AI can't handle torpedo shots. He may listen a lot better than his surfaced counterparts, though. I've never tried, but it might be fun to torpedo one just to see what happens.