Hidden throught the map are 3 "secret buttons" One on the first floor/outside another on the third and one on the last floor. (picture of the button is shown, 7th picture)

we know, But what do we do? Do we hit them in a order or any or at the same time?

well, we beat the crap out of the hole. and it opend :D after hitting switches

its a secret

use noclip xD and go to it

So.. Where is button 3? Button 1 is under the docks outside. Button 2 is on the bottom floor, up the staircase to a locked door, above said door. Also, anyone got the lever combo. Assuming the 4 numbers in the description are the first four its still 120 combinations.

Button three is in the freezer.

Found it. What hole did you mean when you mentioned you broke the hole after pressing the buttons?

Its in the corner, of the room. The room with all those levers.

SPOILER... Go to the many levers and pull 9187. Then press the button under the dock. Then press the button in the freezer. Then press the button over the door in the last room. Go to the many levers. And destroy the boxses. Destroy the corner, on the ground. Secret room

@TheOnlyFloater The button can be pressed in any order and the levers affect access to that room

引用自 Buklau：

SPOILER... Go to the many levers and pull 9187. Then press the button under the dock. Then press the button in the freezer. Then press the button over the door in the last room. Go to the many levers. And destroy the boxses. Destroy the corner, on the ground. Secret room

OR, you can noclip.

Press "V" XDDD