Ohhhhh shit nice catch forgot about that! Maybe this was the last thing they were working on before the collapse? Because the AI does mention Vex mind core samples I think or something right?

Yup.

I always wondered why Fallen followed us in, makes sense if they were trying to get in there to learn what those scientists did about the Vex. And then I wondered why we didnt encounter Vex and now Im figuring they could just hack in or something.

the fallen followed you in because dumba** dinklebot did not close the fing door after we went inside. i remarked on this at the time we went inside and sure enough here come the fallen. like eris says 'in its dying breath the traveler made the ghosts...to OPEN doors'. it never shuts one ever as far as i know. yeah i know it looks like the door broke but the dinklebot can make ships fly after centuries of rusting or raise you from the dead you think it could jam shut a busted door but no.