Penumbra black plague [stuck] - JENS TAKE A LOOK PLEASE

[BasR]

I and many other players need help!

In the beginning of the game you need to enter a room with trusted blood, after I did that i came in this room with sprinklers and unaturel light and stuff.

Since the update there is a new solution needed to solve the puzzle. The barrel is already lit on fire and to make the sprinklers work i heard you must find a hole in the ground (it's behind the door on the right) but there are some bars above it. I can't destroy the bars! people on the forum said the fuse is under the bars but i can't reach it! so now me and a lot of people are stuck in this room.

what is the solution?
Or isthis a bug?