Please Help! I need to know where to find a map.

Before I reinstalled gmod I had a pair of maps which I do not remeber what their names are.
But I can describe them. In the beggining you wake up inside a cell. You need your crowbar to escape and when you do in a side vent you break open the door and then Gman says "wake up and smell the ashes. you then proceed into a room full of metro police. after you kill them all you go into a vent which leads to a flooded pitch black room with a barnacle in it. Does any of this sound familiar?