Quick question. If a U-boat was on patrol for a long while would there be a typical "Water Line" AKA "Scum Line" AKA "Slime Lime" AKA "Algae Line ?
ive been researching , googling,, i just can't find anything definite, image wise.
understandably there would be marked and visible water line on a sub that's been docked for a while.