Melan

Tell me about it. I currently redoing whole submarine from scratch -old brush design was (ironicly)not enough airtight and with all details in place I call it success if fps was above 20.

And IF this will succeed I still will struggle with ship crew -12 men should switch their positions as their shift end, and for some reason it never work as it should. Maybe I should stick with some generic mansion in-and-out burglary.

Isn't a submarine, from a mapping point of view, just a small mansion with metallic walls and some room types replaced with more technologyish versions?

Yes, but it is more restricted: you need to put a number of specific compartments and they have to be placed in specific place -and all arranged into cylindrical shape. Main engine, air compression pumps, air purification, ballast tanks... Of course you can make it like in Thief2 but it is not too convincing for me.