Retrieve the Codex from Danik | 15: A Change of Fortitude Dead Space 3 Guide
Last update: 11 May 2016
When the gate is open, run to the end of the corridor to the elevator, watching out for gas. You'll split with your companion, going to another floor. After exiting the elevator, go to the first entrance to the left - there are flares on the ground. You'll also find several lockers at the wall. Now go outside.
Right after exiting the facility you'll be attacked by Unitologists - particularly watch out for the enemy with RPG.
Weapon Parts 1/2 - On the crate, on right side near the bridge entrance.
After defeating the first wave of enemies, move further - try to quickly get off the bridge, because otherwise you'll become an easy target. This time soldiers will be joined by Necromorphs.
Go to the cargo elevator which will take you up. Quickly run to the next part of the facility, the one, where you can see flames. Watch out for the patrolling helicopter. Near the entrance you'll be attacked by few Necromorphs. Loot lockers and go through the door.
Weapon Parts 2/2 - On the desk inside the room with monitoring system.
Exit the room, walking to the yard. After few steps you'll get attacked by several Unitologists and a horde of Necromorphs. Watch out for the sniper lurking on the building on the left. Try to use stasis to slow down bigger groups of enemies.
After extermination and clearing the field, move forwards. Once you get past the damaged vehicle and approach the interface which unlocks the passage, you'll get attacked by more snipers. Turn around and use the vehicle wreckage as a cover. Hide from the RPG rockets, waiting for a good moment to counterattack.
When it is finally quiet, unlock the door using the electrical interface and go inside. In a short corridor you'll encounter three supply crates. After walking through the next door you'll see Danik fleeing.