Just did this today on tablet. My attempt of the Oberon Class after flipping through my Submarines book when I got bored.
The image was too small for me to attempt drawing details (and I googled, but several results were too different or didn't have top views). So I sort of made it a foggy morning or something XD Take in mind I have not drawn submarines for.... a year and a half or so? I'm trying to dig up my old pics of the HMAS Rankin and my own submarine that I made up for my story (yes I write stories).
I know some parts looks weird or out of place, I am trying to work on more stuff like this...