Now that you've done that, the sewer cap has small hills growing on top of it because of the dents you made, if seen from the surface, so that could still raise suspicion. But, it's better than leaving and entrance to the Sewers open. You are engulfed in shadow. The only light-source you own is the dim blue glow of your Tac-Pad, which buzzes to tell you that your waypoint to the Sewers has been reached. There is a flashlight application on your Pad, which could come in handy in a place like this.