Looking at the original post, the poster asks for help on the two Uboats. One of the posted photos (the bottom one) is obviously a closeup on one of them; but it appears to me that the two at the top are different views of the same boat. There is what appears to be patches of snow or ice along the decking. These patches are an odd shape but I don't think that they're camouflage. These shapes look different but that is only because the photos are taken from a slightly different angle; if you account for the angle, the front patch is lies in the same position alongside the deck gun and the rear patch is similar near the rear of the conning tower.