The atmosphere on LV223 isnt breathable for humans or Engineers since their DNA matches ours and they are only mortal after all, according to David.
Thats ANOTHER story goof right there, because Space Hippy Holloway said that the system had a sun like ours and had a planet that could sustain life. Eh?!
So? There's life on earth that doesn't require the same atmospheric conditions to live as us.
You're letting your dislike of the movie hinder yourself from thinking.
So then - the 'reception party' must be in the pyramid/domes, yes?
But wait a minute, the inside of these domes is essentially a gigantic sewer network of tunnels, shafts and helixes that somehow makes breathable air?
I don't see what the issue is here...there's tech in the structure that is creating a breathable atmosphere.
Oh my god, I only see tunnels and ladders in submarines in The Hunt for Red October...how silly. Somehow these ladders are making breathable air! Sweet Jesus, screenwritiers, get your acts together!
Furthermore, deep within these tunnels is a room that contains a hideous bioweapon that they are apparently loading into Juggernauts, destined for 'naughty planets' that need the black-goo treatment. But the bioweapon is 'activated' and bursts from its container on contact with a breathable atmosphere - like the scene at the waterfall.
No, the goo never bursts forth at the beginning, the guy opens the mini-wok, drinks the goo, and is disintegrated, his DNA broken down and rebuilt, cellular life begins anew, etc...
And it's clearly NOT bursting forth in contact with a breathable atmosphere, because the entire place has a breathable atmosphere, including the room where thousands of them have been stored, just outside the hologram room
. And yet none of those "burst forth".
This is surely the dumbest aspect of this story - why would they store such volatile containers within an atmosphere generator?!
Because it's obviously activated by something else, besides the air, or they would have leaked millenia ago. Human presence, perhaps, which would be suitable seeing as they were purposed for human destruction. There was obviously some sort of connection with the facility, because the murals began to move around before activation. Thus explaining the lack of bursting forth when David brings the single vial to the ship.
So...why exactly did multiple ancient astronauts bother to meticulously describe a star configuration in the sky to many different primitive civilizations so that they could draw it into artefacts or cave walls? Heck, the primitive folks couldnt even see it in the night sky!
I don't know.
Maybe a 'you were made here' sort of thing? Or perhaps a sign of the coming apocalypse, like many christian paintings displaying the apocalypse? Or perhaps it was a sign showing the location of the secret of life, and they only stopped being painted after we pissed them off enough for them not to want to show us?
This is one question I don't know the answer to.