@ von Zelda, No I haven't tried that but I might download it for a hint of the files he used, (found they were u-boat zon files) when you dived did you notice if you had the cloud floating above the U-boat on top of the water, looks funny when you speed it up and turn the U-boat, seeing this little cloud whizzing over the surface of the water!

Also if you exit to menu then reload the game this disappears, as well as the damage texture to the sub, this part may be normal anyway!

@ Racerboy, I have cut-n-pasted the method you describe, I will give it a go, though it will take awhile to narrow it down, thanks.