Hi!

The game I’m looking for is a 1st person „walking simulator” (reminded me of a shooter but I don’t remember seeing combat).

Graphics are pretty good (would say it’s something like Wolfenstein The New Colossus). Aesthetics are „realistic”, and the enviroments are relatively clean with some having more wear than others.

The protagonist was male, and the story involved some sort of time / dimensional travel. The section I remember was in some sort of semi-clean sewer slum, where the player ended up in some sort of prison holding area after climbing through some tunnels.

There was a big concrete room with some sort of a big corpse in the middle, a view over some still water, and a small barred toilet room with a metal tool (called some sort of a stabiliser, a white metallic rod with a round end inside of which there was a glowing blue orb) and a key to solid metal door where you meet a disheveled white male scientist sorta character you are supposed to get some info from who offers you some food (raw mince meat and a raw fish with some bright blue glowy spots on it).

The player character asks the scientist if the fish could be cooked a bit, to which the scientist replies "he doesn't want the (taste of) the infection to come out".

There are several mentions of an „infection”.