First: Forrest is totally right. It's mostly why I haven't made much of a move on my own scenario; it's impossible to find help without incentive to join your project.
Second: The snatch of your post that follows bothers me, and it's a downfall of many scenarios. The pivotal point where the player swings between not knowing and knowing is a place where everyone (with the exception of very few, those including Bungie and the Rubicon team) falters a little bit and the storyline sounds cheesy or hacked together.
Or, in your case, skipped over entirely. How did they find out?
Just something to chew on. Get hung up over the details; they make the scenario more realistic and deeper in the long run.
: Then the crew finaly knew what happened. The ship that was destroyed earlier
: spread a series of nanites onto the hull, and they made their way into
: engineering, breached the core, and began taking bits and pieces of metal
: and other objects and built crude but somewhat recognizable humanoid
: cyborg like entities. They also didn't just get little objects, they also
: affected sets of armour and special hovercraft in the armory, and began to
: infect humans and making them a form of androids with regenerating
: abilities.