As my sig shows, I use the S-18s in pretty much all my Pacific careers

I love the little thing. I'd be interested in looking at your fix.
If I may be so bold as to make a request, since you are poking around in S-18 files anyways... can you maybe try to figure out why it is the only sub in the game (or at least of all the ones I have tried, including modded U-Boats) that the radio does not cut out when submerged? It plays loud and clear no matter how deep.
Thanks!