The sector stored all the geological research of the Science Division, such as all the frozen bodies of the aliens. The frozen bodies were stored in huge ice cubes that were then transferred to the Biology Sector via a lift.
The sector had a large courtyard filled with ice cubes and other containers that serves also as a battleground for the Stalkers.
There was an interior passage way between the Geological and Biology Sectors, however, this is inaccessible for unknown reasons, as well as there is an exterior way through a small canyon leading to an opening below the Sector. An elevator leading up to the courtyard as well as another one to the Disposal Services can be found here.
The entrace to the Silo was located just next to the Geology Sector.
Exterior access Edit
A pathway dug into solid ice and made into a catwalk. The exterior access connects the Biology and the Geology Sectors from the outside. A lift taking up to a courtyard as well as another elevator taking down to the Disposal Services can be found in a small opening area just next to the sector walls.
Disposal Service Edit
See Disposal Service
A large open field with boxes and cubes of frozen alien corpses. Isaac encounters a pack of Stalkers and few Slashers when entering this area the first time, and the second time the Circle will attempt to stop Isaac from reaching the stolen Codex.
A lift used to deliver any cargo to the Biology Sector is located next to the courtyard, leading to the round building overlooking the field.
Geology Building Edit
The accessible area isn't too huge.
Just after the entrance, there is a huge room containing few cubes of frozen aliens as well as a Bench. The second room has a tungsten tongue room. The third and final room is some sort of specimen cutting area, where the workers cut pieces of excavated material with the use of laser beams. However, the laser beams are malfunctioning, forcing Isaac to use a piece of rock to block off the lasers. A piece of Rosetta can be found at the other end of the room. Just after gaining the piece, Isaac encounters Creepers. After this, Circle soldiers will attempt to stop Isaac by rappelling through the rooftop.