Thank you very much for your words and thoughts!
I will go to the ship the next week again and I hope to take more photos... it will be my second time in the ship and now, I know the people, the ship, theire work a bit more!
Sionnac, I don't know this book but I will try to find information on internet about it. Thanks!
mferrarini, I had big problems with the exposures. It was night when they were working and I had only their artificial light, so I had very high contrast scenes. Until now, I worked with an Olympus E-3 DSLR and I was used to use "Puntual" exposure system (no matricial or central) and in the Zeiss Ikon I only have a central pondered exposure system. It has been dificult to me exposure well. I was all the time thinking on how to exposure well. Every time in manual mode, I didn't use "A" mode.
There were some moments where I needed a 35mm focal lens but I didn't have one, so I have bought an 35mm 2.0 for my next "try". I will be able to be nearer in some situations (I hope so) with a bit more of "depth of fild".
Excuse me because of my bad english and thank you very much again.