where to find the sewer in Chapter 2??? (Dead Rising 3)

The plot needs to get into the morgue to take some medicine, I'm in the building where already were once on the street a lot of zombies, where is the drain which you need to get into the morgue??? On the map it does not show, in General, tell me where to find it, and then I stalled just kapets, the Building in which, if he had had to run out and run to the right and then the first left turn continue straight then I just hit the wall so I understand the morgue, but there all doors are closed. In short, how and where do I find a sewer?