[Sailor Steve]

Another part of the problem is that in real life you don't dodge around sub nets. They stretch clear across the harbor and have a 'door' which is pulled aside by a tug when ships need to get in or out. One way to do it in the game would have been to have the nets set deep enough that a surface ship could pass over them and a sub would have to do it on the surface.

Whatever the problems with making it work, raiding a merchant port should be difficult and dangerous. Raiding a naval base should be next to impossible.