Check the document on the table and get informed that the password to the finance room is written on the office blackboard.
Proceed to the office and see the password on the blackboard.
Go downstairs and use the password 64231 to enter the finance room.
Climb through the ventilation duct and descend to the meeting room. Pick up the axe at the entrance.
The monster is cumbersome. Walk around the table, keep staying behind its back and remain undetected from it.
Hurry up to the office and crack open the lock to take the rounded valve.
Go to the warehouse entrance and close the door. Pick up four wooden planks and use one of them to block the door. Install the valve on the iron door.
The monster will ram the door as the valve is being revolved. When an acute noise of cracking is heard, which means the plank is broken by the monster, stop revolving and block the door with another plank. Repeat this procedure until the iron door is opened by the revolving valve.