Here's my terrible rendition of trying to re-create the effect in Photoshop:
What I tried was creating a layer mask as an artificial depth map (make the hands closer and the other stuff further away), then used lens blur with the alpha mask to blur the stuff further away more. Then, I adjusted the levels to make it look super gloomy, then added a grey overlay and some noise.
I’m not terribly convinced that this is very much post processing at all. Some of these were shot by Marek Chaloupka “through milk glass.”
I don’t know what “milk glass” is but it appears to be a type of frosted or etched glass or some type of plastic that appears frosted. A large amount of soft light is coming from the subject side of the glass/plastic causing the backlighting and, where the subject touches the glass/plastic, no light can bounce so it appears black.
Standard tweaks may have been done (turn to b&w, contrast, etc) but I believe all these images to have been shot this way on purpose - not a random image edited to look like this.
So, to answer your question: you must first start with an image made from backlighting and shot through “milk glass” and then tweak.