Stuck BlackPlague chemical room dark kennel code card.

[Tommy Gun]

For the door with the chemicals, you fix the pipe, by replacing it. (you knock out the bad one) then you should be able to enter.

and yes, 2 -3 infected roamin around.

Key card: kennels, get metal crates and block the holes in the corridor with the electric switch. then flick the switch.

I'm going to reccomend 'Scraper' here, he has released very good walkthroughs of overture and black plague, just look up "scrapers walkthroughs" or "Scr9per" in youtube.... or his website.

Run back, and follow the lights, pick up the card, follow the lights back.