You have to find the switch, which is down near your feet, and push it.
by the green cabnit and what is useful in the secret room is the bell clapper
The missing bell clapper is hanging from the ceiling.
It is in the secret store room behind the filing cabinet in the detention room on Big Nate Island. You need the blue prints from Nate's locker in order to access the secret room.
You have to find the switch, which is down near your feet, and push it.
As you go into the floor behind the filing cabinet in the detention room, the light switch is right at the bottom of the ladder, on the floor.
you climb up the rope
The clapper.
When You Go Into The Secret Detention Room And you jump down the Light switch is on the wall.
The entrance to the secret room under the detention room is in the filing cabinet.
in the detention room
It it in the secret passage in the detention room on Big Nate Island.
there is a light switch next to the ladder click on it and it won't be dark any more