My personal favorite is "Trigger Maru Overhauled" with the "Run Silent, Run Deep Campaign" mod.

Actually, Trigger Maru is concentrated on the US campaign, but it's good to have the UBM expansion installed and then you'll be able to use the latest version of the mod. Without that you can only run an older version.

It changes an awful lot of things, expanding the number of commands, goes a long way towards realism (more dud torpedoes for example), makes the game much nicer, etc.

There is also another huge contender called "Real Fleet Boats". Never tried it myself, but I heard that it's taking realism to the extremes. Perfect for the enthusiasts. :)

You can find all of these in the mod forum's stickies.

Again, many thanks, Sensei! :yep:

Hehe, you're welcome. :)

Captain, I didn't want to butt in while Hmuda was giving you great advice, but I'd like you to spend some time over at the Sub Skipper's Bag of Tricks thread. I think you'll find a lot of neat stuff.