The look is right; Paris, how can you miss? The music is dramatic. The camera department have got their chops down. The sfx are nothing new, but still are interesting. The premise is meh, but okay. It is the writing that turns "En immersion" into a 5.
There are plot holes you can a truck through. I can't comment as even with a turkey like this I'm not going to give away a spoiler. There are too many characters---- and most are just stock characters doing stock things. Actors just do what is on the page and this case they've little to work with, though they try. There are subplots that are underdeveloped, perhaps 5 or 6. Characters come and go, yet never move the story forward.
It was like this was conceived on a Friday night. Written over the weekend. A week of pre-production and casting and shot the following week using that 1st draft. It's almost as if you can hear those words, "don't worry we can fix that in post. We'll have cool sfx, a dramatic score and great editing." All in all I'd say give it a pass and watch something else. Spain, Italy, Belgium, Holland Denmark, Argentina, Scandinavia, Chile have fine cop thrillers; most countries have cop thrillers better than "En immersion." Look around you deserved better.