What should I do with the waterwheel?

Hint 1 of 7:

Try to get past it.

Hint 2 of 7:

Maybe you should turn it off.

Hint 3 of 7:

Did you take a close look at the door?

Hint 4 of 7:

Did you try to open it?

Hint 5 of 7:

Maybe the chain will help.

Hint 6 of 7:

You can take it with you,