The sealed sewers is an unmarked location in the Mojave Wasteland.
The sealed sewers are accessed from the central sewers. A key called Luke's find must be obtained to enter, it is found on "Blind" Luke in a room in the central sewers or "Sweet" Jill in a room in the east central sewers.
The south part of map contains a room filled with several feral ghouls, including a feral ghoul reaver.
The sealed sewers appear only in Fallout: New Vegas.
ps3 xbox360 It is possible for companions to get stuck in the entrance of the sealed sewer, rendering them incapable of moving from their location. [verified]