OK, so I'm assuming Steve and Kael are going right. If so you reach the end and look down another corridor facing right, at the end is a turn left. Something-looked like a guard-has just gone down it.
Andrei and Marxus are up on the next floor (3), it's the same as all the others except the door is on the other side of the room. The area underneath each of the ramps upwards is a little darkened if you want to hide the bodies there.
*mental picture of an asgard dragging along a body 😂*