Dead Space 3 Walkthrough Part 1 – Prologue: Beginnings
The game begins in the past as Tim is returning from a mission. He is on the icy world of Tau Volantis. Start by going straight forward, following your locator beam. Head past the first large rock pile on the left and turn to the right of it. In front of Tim should be an artifact. Approach and grab it for a S.C.A.F. Artifact. Now return to the locator path to the right. Follow it until you reach the wreckage.
When the blizzard abates Tim will have a few things to say. You can run up to the wreckage. The Doc will have a few things to say then it is up to Tim to get inside the wreckage. First, follow the prompts to collect some ammo from the 3 containers around you. Reload your weapon then aim at the latch on the door. Give it a quick burst to break the latch and clear Tim's way inside.
When Tim opens the door he is attacked by 2 strange men. Shoot them down and be sure to stomp their bodies to get some more ammo. Head inside and turn to the left then right. As Tim goes down the first corridor, another strange person will appear. Gun him down and once again stomp his body to get more ammo. Turn the corner to the right. Tim will be surprised by 3 Necromorphs appearing one after another. Gun each of them down in turn, backing away and bashing them appropriately.
With those Necromorphs dead, look to the right for the ladder. Head over to it and interact with it to climb up. Go forward and interact with either of the panels on the side of the cockpit. This will open the door and let you through. Approach the center console of the cockpit to find the codex Tim was sent to find. The moment he grabs it though things start going bad. The ship is beginning to fall.
Start by just moving forward. Head forward to the first gap. Once there, note the button to jump it. Just keep moving after that, jumping with the run button as needed. Once Tim gets through this section, things do not get any easier. As he touches down the ship itself will fall and come toward him. Roll to the left and to the right to avoid the debris coming at him. Be absolutely sure to steer clear of the engine as it will kill him instantly. Once the ship passes over him the worst of it is over, for a moment. From there enjoy the cinematic that finishes out this chapter.