The Corpse

 The Corpse, known as Corpus Christi before the Great War, now consists of the underwater remains of the Corpus Christi Naval Base in the Texas Wasteland.

Layout
The city itself is a huge wasteland, with just parts of buildings sticking out of the sand. It consists of one large map leading the new coast created by the rising of the Gulf of Mexico, where the Corpus Christi Naval Base has been submerged. There is now a strange plant sticking up out of the water. 

Getting into the base itself requires traversing two medium underwater maps where mutated fish and hostile plants will be encountered. The base is made up of five medium to large maps containing robot sentries and increasing amounts of plantlife towards the boss area. It swiftly becomes a jungle like environment very similar to Vault 39.

Miles Reese was conducting research into a G.E.C.K.s capabilities that he had stolen from the Nursery, in order to protect his base, located in the Corpse. However, over five years, the G.E.C.K. began to terraform on a dangerous scale, including within enclosed structures, and occasionally produced carnivorous plants. It could generate unnatural weather patterns and his experiments created jungles within deserts, and areas previously covered by water re-flooded on an even larger scale. As Miles continued to tinker with the G.E.C.K. its capabilities became sharpened he worked to focus its power on the specific tasks of covering the Corpse with an protective, organic shell.

Related quests

 * The player character has to visit the docks, where Jackal raiders wait for them, wearing full power armor. After taking them out, the player character finds an underwater suit and they are able to access the base.
 * After the player character has fought their way into and through the naval base, they will move on to the final fight with Miles Reese, who has the use of vines for attacks and has merged himself with the plant walls. The player character must overload the modified G.E.C.K. and escape before the facility explodes.

Appearances
The Corpse was going to appear in the canceled Fallout: Brotherhood of Steel 2.