Talk:Dishonored (Mission)/@comment-213.192.67.101-20131011142211/@comment-16533050-20131011221657

After you go over it and the two guards get eaten... keep following along like normal. After you drop down facing the sewers, turn. The gate should open, but the rats will attack you. Kill them off and you can enter.

I did that once... a while back. I don't remember what was in there except for the incendiary bolt.