The room located inbetween the two East central sewers doors contains several feral ghouls including a glowing one. You can find a worn key in the inventory of the glowing one. A terminal with access to Central sewers control is also located here.
The exit marked "Mojave Wasteland" is an exit to Camp McCarran. It is guarded by NCR troopers.
There are two dead prospectors in this location. One is in a room off to the left of the long north-south tunnel on the east side of the map. The other is near the center of the map where several tunnels intersect. Both contain various guns, ammunition, and food.