LV-426 loss of magnetic field.

watching the trailer ive an idea that they dont suspect that inside the ampule roome there is breathable air ..there are different shoots inside the ampule room some with helmets and some not . The guy that is hit from the acid ( if its the same incident ) is show first with helmet and then without ...while outside and with the hangar open they have always the helmets ..also the sand storm seems to arrive by surprise . the only doubt ive is that the ones without helmets in the ampule rooms are only for magazines . So my final assumption is that inside the ampule room there is not only the face of man but also his breathable air ( and dna )

thus, the ampule room was intended for us

Yes, maybe. What does that imply?

What if the explanation were more simple than going into theories about the planet? What if the room with the head was a closed environment on board a ship with life support systems? What if the ship when it crashed--as seen in Alien when the crew has their helmets on--had it's hull compromised, which depressurized the air, thus causing a need for helmets? Your magnetic field theory is plausible, but I think there's a simpler explanation for it.

The large dude I assume is the engineer or jockey isn't wearing a helmet. There could be a lot of explanations here. When they first enter the room they don't realise there are breathable conditions.

Or maybe the closer they get to the ship or ampule room, assuming one are same, the better the atmospheric conditions are. Which would lead me to question. Is the jockey in the midst of developing a new earth only to have it's plans inadvertently wreaked by man?