The exploration of the node network uncovered on Atlantica by the crew of the Edward Deming would lead them to the shell world of Ctoggha. In initial exploration of the area would reveal at least two levels of a shell world created by Aliyums. Of the areas explored, one of the shells appeared to contain a forest while the other shell contained several walled off cities filled with uplifted creatures.

The initial exploration was conducted to locate two lost Grawla who had accidentally come through the node network to this location following a series of altercations during the Iconman Zavul's attempt to remove the node network from the planet Hawking.

Further exploration of Ctoggha was cut short, following the outbreak of hostilities between the American Union, Magnetic Assembly, and the coallition of peacekeeping forces in Atlantica.

Though only a small amount of Ctoggha has been explored the general structure of the shell-world can be infered from what has been learned during the exploration of Azathoth by the Magnetic Assembly and Grawla. The Shel World is comproised of some number of shells using advanced acive support technology to create multiple nested worlds worth of floor space. Large illuminating tubes stretch along the areas above a floor to provide light. Its not clear where the power to run this comes from as exploration of Ctoggha has not been able to reach any sort of power source or observe the exterior of the shell world. It is suspected that the areas the node appeared on may have originally been the surface of the world, but this is speculation.

The initial level uncovered by the first expidition. This area is largely made out of some grey ceramic like material along the floor. There are four major locations:

* The node exit: a tunnel that connects from a location on the surface of this level of the shell, to a pocket space inside of the node network. It is through here that travel from Atlantica can occur.
* Ooze City: A city a few kilometers in diameters surrounded by a wall made of the same ceramic like material on the ground. Inside of this area are structures created o the same ceramic material as well as structures assembled from oganic material and scrap collected by ooze creatures inside of the city. This area also supports a small ecology of plants and small creatures.
* Crab City: Similar to the Ooze city, the Crab City houses a population of uplifted, person sized, hermit-crab like creatures along with their supporting ecology. It was mentioned that death of a crab while inside of the city limits will trigger an investigation by the Aliyum machines that maintain the shell world. Similarly the Aliyum machines also provide an amount of food to the crabs in addition to maintaining the ecosystem of fish, small animals, and fungal-forests near the city.
* Containment Pyramid: A black Pyramid housing a prison for an Aos Si who was captured sometime during the Nodal Collapse a few thousand years ago.

Unexplored, and briefly glimpsed through a triangular hole near the Containment Pyramid. This is a shell world that is below the entry layer that has a forest area just below the entry point.