These are, I’m told, the work of one Sergei Larenkov, and they are wonderful. He’s reshot WW2-era photographs in the present day, from their original perspectives, and then faded the original in. Just look:
The effect is similar to those occasional freak photographs purported to capture ghosts on film.
I prefer to imagine a WW2-era photographer developing his or her prints, and discovering strange colour images bleeding in around the edges of their shots.