Need help in cistern entrance

[Googolplex]

So, nothing is like it should be.
The eastern bridge is stucking and to repair it, I did not knew how to do that.
Normal you need the crank to get out of the door (I knew that from the first time I played the game) when all is done.
But nothing is correct.

I have uploaded the savegame.
Maybe you can solve this quest.

Please try it if it works for you.
http://www.file-upload.net/download-3312..._0.7z.html