I tried to figure out what's wrong but I can't...
I suspect that a tower from another sub type was fit onto mine but I am not sure.
I replaced the SClass textures and the PClass Textures with the textures from the USS Trout archive but to no avail.
[Edited] I 've found it!!!
It's the gato tower that is fixed on my USS Trout. I went to wikipedia and found photos of all classes of subs....
I replaced the NSS_GatoTower_T01.dds and NSS_GatoTower_T02.dds with the files from the USS-Trout archive and voila...

Now I have The body and tower of a Tambor and the antennas of a Gato Class

Is that normal? To fit a tower of one class to another?
I hope you can fit the killflags on that

Sorry to take so much space on your thread....
Cheers Dimitris