The Diamond Key opens the door near the 1st save room. Have your shotgun ready,because this cramped room is full of zombies.There's only a film for Leon to find in here. The next room is where Marvin was found earlier. He's no longer among the living,though. Grab the Heart Key from his room and get out of there. This key only opens the door in the office area to the east. This hall leads to the basement area. Cerberus dogs lurk down here,so watch out for them. One of the rooms down here is a power room. Flip the switches up down down up up to restore power to the card reader by the adjacent room. This does nothing now,but it will later. In the parking lot,we meet Ada Wong,and quickly learn Leon has trouble with women. We find another person named Ben in the cell area,who tells us about a path through the kennels. Grab the Manhole Opener and head for the kennels. There's a red herb in there,but the dogs will break loose if you grab it. Climb down,run past the giant spiders,and you'll soon find another save room.