Still no explanation how it crashed nor why its only that one when a high tech civilistation easily should have lots more ships, and also: why do they have only one small city at that point? the whole planet should be full of engineers and towns for a civilistation of that tech they have.
David dropping the pathogen at the center of the one town they have is enough to wipe out the planet and no ships or defences of any kind escape or react, no engineers soldiers start to get into action etc, the ships and people on the other side of the planet should react to this?
Unless something like planet of the apes happened and that is litterly everything left of them which would explain the lack of pretty much anything a space traveling civilistation should have.
Or its one of the engineers species they created and colony on that planet which is very low tech which explains the lack of so much and they only have that tiny town.
Nice find and didnt see much of those objects and tech in the movie, but still it dont fit together with what a high tech civilistation demands to work compared to what we see they have.