Explore the laboratory

You step into a long corridor, the miasma is everywhere, this looks like a dumpster, full of old broken machines, garbage, and overgrown vegetation.

After a few minutes, you arrive at the lab, the big pressurized doors are broken, when you step inside you notice, a room with two huge capsules, but you can't see what's inside, the whole room is filled with a phantasmagoric flickering light.
At the end of the room, there is a room with an old man wearing a white coat, and a nurse, they are reading something on a screen, and they are not aware of your presence.

You take a heavy iron bar and start to think of a few options...
Check the room with the capsules, take advantage, and knock out the nurse to deal with the old man, or knock out the old man and deal with the nurse.